Abstract
The tombs or funerary monuments are one of the most important elements of Iranian-Islamic architecture that in different fields require careful investigation. This group of buildings is important among Iranians; for this reason, in each period of the Islamic era of Iran the most important and most used arts related to that period have been used in their construction. Generally, the decoration in buildings has a more effective role, because, if it is understandable in terms of form and structure for archaeologists and designers, it’s possible this isn’t understandable for the general public. So, decorations in the buildings at first sight are attracts the viewer. In this article epigraphy art as one of the most important decorative elements of Islamic buildings have been reviewed in the four Seljuk tombs of Northwest of Iran: Gonbad Sorkh, Borj Modavar in Maragheh, Seh Gonbad, and Gonbad Kabood. The research method in this study is interpretive – historical. In this study with analytical method have been studied decorations of these four tombs (especially in terms of architecture, motifs, inscriptions and their position on the buildings). Also, in addition to reviewing the articles, books, and evidences, with field survey from these tombs, plan and decorations, and then a comparison table of inscriptions has been provided. In this regard, the following questions are raised:
- How is architecture, motifs and decorations of the Seljuk tombs in northwest Iran? And, their inscriptions are divided into several categories in terms of content?
- What are the effects of concepts of the inscriptions on position them on the buildings?
Reviews show that inscriptions of Seljuk tombs in the Northwest are divided into four groups: The Quranic verses, inscription with the theme of the date of construction, inscription with the topic of prayer, and inscription with the theme of the architect and the builder. On the other hand, position these inscriptions in the buildings have been differed proportional in their content. Inscriptions of the Quranic verses in the highest section of building, inscription with topic of prayer in the lower, inscription with the theme of date of construction and architect and builder are placed on the lower levels and on the body of building.
Keywords: Islamic architecture, Seljuk tombs, Northwest of Iran, decorations, inscription.

Introduction
Generally, one way of cognition more about periods of Islamic architecture besides of decorative elements and motifs, is study of inscriptions and their texts. In the Seljuk period, one of their architectural features, are create inscriptions and decorative lines from shaved bricks, that in most of buildings this period (especially tombs) is seen. Furthermore, due to the difficulty of shaving the bricks and the formation of letters and words with it, during this period, the Naskh script was replaced by the Kofi script and inscription with style of stucco was used (Hatam, 1999: 162).
In this article, in addition to reviewing the historical background and the process of build tombs in the Seljuk period to study and compare four tombs in the Seljuk period in Northwest of Iran, first have been introduce architectural features and decorative motifs them. Then, in comparative tables have been specified types of inscriptions and their position on the tombs. In this regard, following questions are raised: How are architecture, motifs and decorations of the Seljuk tombs in northwest Iran? And, their inscriptions are divided into several categories in terms of content? And, what are the effects of concepts of the inscriptions on position them on the buildings?
This study shows, inscriptions of Seljuk tombs in the Northwest are divided into four groups: The Quranic verses, inscription with the theme of the date of construction, inscription with the topic of prayer, and inscription with the theme of the architect and the builder. On the other hand, position these inscriptions in the buildings have been differed proportional in their content. Inscriptions of the Quranic verses in the highest section of building, inscription with topic of prayer in the lower, inscription with the theme of date of construction and architect and builder are placed on the lower levels and on the body of building.

Buildings under study
Gonbad Sorkh: The Gonbad Sorkh is oldest tomb in the Maragheh that is located in the southern part of the city and west side of Hashtrod road. Generally, in the Gonbad Sorkhon and in different parts and also on all sides this tomb is inscription.
Borj Modavar: The Borj Modavar is second tomb built after the Gonbad Sorkh and inside the city of Maragheh. This tomb now is located in Khaje Nasir Street and behind the building of Bank Melli. The Borj Modavar has two inscriptions that both of them are located in the main direction of the building and facing the North. 
Seh Gonbad: The Seh Gonbad is third tomb that was built in the Seljuk period in Azerbaijan. This tomb is located in the southeastern of Urmia city. The three inscriptions with Kofi script and geometric motifs at the facades of this tomb have created beautiful view.
Gonbad Kabood: The Gonbad Kabood after the Gonbad Sorkh and the Borj Modavar is third of building that has been made in the Maragheh city. In this building 5 inscriptions are visible.

Conclusion
It’s certain, in Seljuk period and in the method architects and artists of this period, concepts of inscriptions have played an important role in location of inscriptions. According to this, inscriptions of Quranic verses and inscriptions of mystical concepts and prayers have usually been located at higher levels. Other inscriptions (such as inscriptions with historical or political themes) have usually been located in lower levels. The location of inscriptions in buildings from the down to up in four sections 1, 2, 3, and 4 in the table below is shown.

Abstract
Rocky sanctuaries are the most valuable works of Iranian architecture, that have been formed over a long period of time, and due to the continuity of traditions or slowness of the transformation process, their exact date is difficult. Among them “Kohulu Mechid” is the rocky sanctuary in the city of Maragheh, East Azarbaijan, which, no coherent studies have been conducted around it yet. This research seeks to provide dates and more acceptable practices for this sanctuary, through a comparative study and a review of some of the details, though deep and accurate research needs archaeological speculation and science. However, according to available evidence and based on the present research, this rocky structure was created during the Ilkhanid period and the nature of its usage, religious sanctuary , is proposed for non-Islamic religions, including Buddhists and Christianity, that is called mosque with religious reforms in later periods and its user modification. 
Keywords: Maragheh County, Gheshlagh Village, Rocky Sanctuary, Kohulu Mechid, Gahengari.

Introduction
The emergence of rocky architectural studies in Maragheh county is considered, one of the most important factor of the non-identification, registration and introduction of rocky cliffs in the Sufichai river basin. The identification of these cliffs was carried out in the solar year of 1393 with the aim of studying and archaeologically investigating of the handcrafted architecture of the city of Discussion and analysis According to the studies, the best period of the time formation of this sanctuary is related to the Islamic era and the capital of the city of Maragheh at the during of the reign of Holakukhan. In the Ilkhani period, the city of Maragheh was the bedrock of religious developments, and followers of religions such as Christianity (Rashidawe, 1368, 190) and Buddhists, they have had sanctuary and ritual sites for themselves. In this period, Christians and followers of Buddhas had a majority, and Muslims were a minority. Also, during this period, a group of Mongols tended to be Buddhist, and Buddhist temples were scattered throughout Iran. (Eshpouler 1368, 187) Therefore, measuring the location of this sanctuary with mosques indicates the essential difference of this handcraft space with mosques. also The presence of the altar on the western wall, which is very similar to the altar of the Buddhist temple of sinless Imam Zadeh, it is a testimony to the non-Islamic nature of this sanctuary. Maragheh in the form of a master’s degree thesis in the field of archeology (Sattar Nejad, 1395). In this article, we have tried to describe the nature of its user and Gahengari by using of archaeological approaches after the introduction of the rocky sanctuary of the village of Gheshlagh. With these interpretations, this study seeks to answer two fundamental questions about the rocky handcrafts cliffs of Kohulu Mechid. 
1) What was the relative Gahengari and the time of the formation of the handcrafts cliffs? 
2) the nature of the handcraft sanctuary belonging to which religious groups? 
The hypotheses considered in relation to the above questions are: User as one of the ritualistic sites of the followers non-Islamic religions residing in Maragheh, at the illkhani period, especially the Buddhists, and the time of its creation done in a comparative way on the basis of analogical Gahengari principles, which is relates to the period of Illkhani. There is evidence of this claim at the rocky handcraft sanctuary of Kooholo Mached, which has been investigated in order to do research. 
 
Conclusion
The creation of a altar, a dome cover, decorative niches, and the delineation of the rocky structure of the Kooholo Mechid, all of which are associated with the ritualistic user of the rocky effect. This rocky structure is comparable to non-Muslim religions and sanctuaries religions, espasially Buddhist, in terms of its location, its landscape, its altar, and the appearance of niches. Accordingly, the aforementioned rocky sanctuary was established as one of the ritualistic sites of the Christian or Buddhist period of the Ilkhanid, in which the space pagoda hypothesis is more evident. Thus, during the period of the Ilkhanis of the Maragheh capital and the formation of a scientific observatory collection , peaceful policy and support of the Illkhani’s authorities from Christians and Buddhists, it created worship places for these religions in the rocks of the city of Maragheh. But the reform of the Ghazan Khan period, which was based on the destruction of Buddhist and Christian temples, caused the burning of this sanctuary and its user modification as a mosque. 

Abstract
Archaeological excavations in Yelsuie Germi Castle, very rich findings and valuable documents such as pottery, architecture and other handicrafts were identified and excavated from under a mound of soil that can play an important role in the detailed analysis of this area. One of these landmarks is an unknown structure with complex architecture and building elements located on the hills of the castle near the Sambur Chay River. This building has sections and spaces of four corners that the presence of water conduction paths into the building on the walls and water outlet channels in the floor, has increased the importance of the building and has made it more difficult to identify and evaluate the main function of the building. In this regard, the present research is descriptive-analytical and based on field studies and review of library documents, while identifying and introducing the mentioned building, seeks to find a logical answer to the following questions: What is the usage of the unknown building of Yelsuie Castle and how did it work? What era does the unknown building of Yelsuie Castle belong to? Studies were carried out show that the unknown building is due to the presence of ponds and inlets and outlets water conduction paths was in association with water usage, which is probably used for the preparation and processing of clay, and accordingly by the authors, The name of the building is called “clay processing building”. On the other hand, the study of pottery obtained from different spaces of this building and its comparison with other areas, confirms that this building belongs to the Islamic Middle Ages and the Seljuk period.
Keywords: Germi, Yelsuie Castle, Clay Processing Building, Pottery, Medieval Islam.

Introduction
The current research method is based on a descriptive-analytical and historical approach and its data collection is in the form of library and field studies and archaeological excavations in the area. According to this, at first, the whole building and its various spaces have been drawn, designed and three-dimensional with the help of various software; Also, in order to achieve the most accurate information and general analysis of the building, the obtained pottery from inside the brick building has been compared and matched with the pottery works of other areas of the Islamic era. The ancient place of Yelsuie Castle in the Ingot section of Germi city consists of a small castle on top of a high natural hill and a residential area located in its southwestern part. Yelsuie Castle is located in the watercourse of Sambur Chay River. Easy access to river water resources as well as the precipice situation in the southern and eastern part of the hill on which the castle was built, is one of the most important strategic features that has been influential in choosing this place to form such an area. In general, this area can be considered as one of the most key Islamic area in northwestern Iran. The brick building is located on the eastern side of the castle and on the watercourse of the Sambur Chay River. In this regard, in order to identify this brick building, a workshop called Workshop No. 4 was created in this part of the area by the excavation team. While continuing the excavation process, a brick building with special architecture and unknown usage was discovered. The mentioned building has an almost rectangular plan that includes several spaces inside. The main materials used in the structure of this building are bricks with gypsum and lime mortar, and in some parts, especially in the outer parts of the building, river rubble has been used. The walls of the brick building are completely smooth and flat and are made with an average width of 50 cm and the height of all of them is the same and is about 70 cm.

Discussion
In general, according to the general structure of the brick building, the most reasonable usage for this architecture is being a pottery workshop and processing and preparing clay in it. One of the most important steps before making pottery is to find the right clay or grinding clay, without clods and other materials. Therefore, for this purpose, it is necessary for the pottery clay to be well shaped, sifted, cleaned and prepared. It seems that small ponds that are embedded lengthwise in different parts of the brick building; Along with water inlet and outlet channels, they are made for just such a use.  In fact, in this building, water is directed into these ponds and collected in them through small canals that are embedded on the walls. After filling them, in the next stage, the clay, which was suitable for pottery, was mixed with water inside these basins and became a slurry. While mixing the clay with water, the water flow is redirected into these ponds again, and during this operation, the excess material inside of the soil as well as other additional materials are poured out of the ponds along with the excess water into large side spaces. And was led out  of the building by floor channels. Also, the grains of sand that may have been inside the clay, due to the weight of the bottom of the ponds and the parts that are embedded in the bottom of the floor, were deposited. After doing this, the water flow was cut off and the produced clay was deposited in the ponds for a few days and remained there until it was soft and smooth and so-called settled. After a few days, the prepared clay was collected and transferred to pottery workshops and then to pottery kilns. 

Conclusion
In fact, it should be added that the existence of various pottery in various forms, styles and techniques in Yelsuie Castle indicates the possible presence of pottery kilns in this site, which also confirms the fact that the brick building is a workshop for producing high quality clay. On the surface of Yelsuie Castle, there are limited traces of pottery balls that indicate the presence of pottery kilns in the area, so that with the help of these balls, the temperature of the kilns was regulated. In this article, 3 maps and 13 images including the castle itself, its geographical location, as well as the brick building and its various parts are given. Also, in two tables, the types of obtained pottery from the brick building are displayed, and in another table, similar samples of obtained pottery from other sites of the Islamic period in other parts of Iran have been compared and matched. According to potteries and other artifacts, the date and time of construction of this building should be belong to the Middle Ages of Islam and the Seljuk era.