Abstract
Recent studies in some archaeological sites of the Central Plateau of Iran and Afghanistan show that a style of decorating potteries known as stamped decoration was favorable to the Sassanid artists. Vigol, an archaeological site located in the northern Isfahan province (Aran and Bidgol), is one of those sites with several examples of Stamped motifs. This paper aims to study the patterns and abundance of stamped motifs and their chronology through comparative studies. Thus, our goal is to answer these questions: What are the patterns of stamped motifs in Vigol and how can we provide statistics on their frequency? What similarities do these motifs have with other common motifs in the art of the Sassanid period? Which of the existing samples can be compared with other motifs from Sassanid sites? The research method is descriptive-analytical which mostly relies on field and desk research. The results show that the motifs on the 49 stamped potsherds can be divided into seven categories, including heart-shaped, vegetal, circular, geometric, abstract, arch-shaped, and paisley patterns (Boteh). The first group of motifs including heart-shaped, vegetal, circular, arch-shaped, paisley, and some geometric motifs, are comparable to some artistic aspects of the Sassanid period like stucco design or reliefs and stamped motifs from other Sassanid sites. Chronologically stamped motifs of Vigol are comparable to some sites like Sassanid sites of southeastern Tehran province, Chal Tarkhan of Ray, Qaleh-Gabri and Langi-rud of Qom; and sites like Qasri-Abu Nasr, Ctesiphon, Qal’eh-i Yazdigird and Mes Aynak outside of the survey area. Several geometric and abstract motifs seem to be local and similar examples cannot be found.
Keywords: Aran and Bidgol, Vigol, Sassanid Art, Sassanid Pottery, Stamped Motifs. 

Introduction
Vigol is located in the southeast of Aran and Bidgol, nowadays surrounded by dunes deserts, and shrubs that cover most of the site. Based on some early and middle Islamic texts, this site was probably one of the villages around Kashan. In Tarikh-i Qum (History of Qom) written by Hassan ibn Mohammad Qomi, Aran, Haraskan, Noush-Abad, and Halil are mentioned. Some scholars believe that Halil is the same as Vigol, although its name is not mentioned as Vigol in Tarikh-i Qum (Mashhadi Noushabadi, 2017: 36). Nevertheless, what attaches importance to Vigol is the presence of two castles in the east and west of the site, mainly referred to as two separate urban structures of the Sassanid period. Also, a Fire temple unearthed in the vicinity of the western site is a unique example of Sassanid art and architecture that emphasizes singlehandedly the position of Vigol among other sites that belong to this period (Javari, 2015: 87). But we can’t escape the fact the existence of this fire-temple caused other studies, including potteries, to be forgotten. So, there is no comprehensive study focusing on Vigol’s potsherds and their importance in understanding the typology, classification, and chronology of the Sassanid pottery. The only paper available that covers Vigol’s pottery is the one that exclusively studies 98 potsherds of the Sassanid period. Results show that Sassanid pottery includes a simple and unglazed type with shapes of all kinds such as bowls, bins, jars, vats, pots, flats, trays, lids, and handles, which are comparable with other Sassanid sites of the west, northeast, south, and the central plateau of Iran.
But this paper’s focus is on Vigol’s stamped pottery of the Sassanid period. Concerning this issue, we have chosen 49 potsherds with stamped motifs and analyzed them based on their piece and patterns. These potsherds mostly belong to the body of earthen wares, but some rims, necks, shoulders, and bases are also examined. Shapes such as necked jars, closed-mouth jars, bowls, and lids are also decorated with stamped patterns. These potsherds have dough in the buff, red and brown colors, they are wheel-made with a decent firing. The temper includes minerals such as fine and coarse gravel, sand, lime, mica, and quartz and plants such as straw. Considering motifs, we have divided potsherds into seven categories: heart-shaped, vegetal, circular, geometric, abstract, arch-shaped, and paisley patterns (Boteh). In general, these motifs form the basis of our current research, thus other measures such as shape have been avoided.

Discussion 
Studying Vigol’s potsherds shows that potters were particularly interested in this type of decoration and used it in all kinds of shapes. Many of the stamp motifs of this site have traces of the Sassanid period and are reminiscent of the religious-ritual beliefs and artistic interests that dominated this historical period. Motifs include heart-shaped, vegetal, circular, geometric, abstract, arch-shaped, and paisley patterns (Boteh), among which the usage and variety of abstract motifs and geometric motifs are more visible. Abstract motifs were used as decorative borders on the lower part of the rim or the body of the vessels. Geometric motifs are also usually borders with incised motifs in horizontal or vertical rows and are even scattered all over a potsherd. Also used in horizontal or vertical rows as a decorative border, are circulars which are among the other diverse motifs. In some cases, these motifs have been used in the frames of incised motifs in the body of an earthenware. Due to the similarity of these motifs to the sun or the lotus flower, they cannot be separated from the religious-ritual beliefs ruling the Sassanid period.
Motifs in small numbers such as heart-shaped, vegetal, arch-shaped, and Boteh, are important considering their content and similarity to other artistic and ritual aspects of the Sassanid period. Despite the common usage of heart-shaped motifs in other forms of art in the Sassanid period such as stucco design, reliefs, and garments, these motifs are among the diverse items of Vigol’s potsherds, and unique when we compare them with other Sassanid sites. These motifs also decorate pots in vertical and horizontal rows and share a similarity of designs with the stucco of well-known Sassanid sites of Barz-Qavale and Ctesiphon. Compared to other motifs, heart-shaped motifs are the only case that evokes the arts of the Sassanid period in such diversity. 
It must be admitted that most of the stamped motifs of Vigol are similar to the potsherds surveyed at other Sassanid sites. Thus, for a more reliable chronology, we have divided Sassanid sites into two categories: Sassanid sites of southeastern Tehran province, Chal Tarkhan of Ray, Qaleh-Gabri and Langi-rud of Qom located inside the area of survey; and sites like Qasri-Abu Nasr, Ctesiphon, Qal’eh-i Yazdigird and Mes-Aynak which are located in the outside. 
Some stamped motifs such as circular, vegetal, and several geometric motifs, are comparable to other motifs obtained from known Sassanid. But some other geometric motifs, vertical or horizontal rows of abstract motifs used in the decoration of earthenware, seem to have a local nature. Because a similar example of them has not been found among other common arts of the Sassanid period and sites with stamped motifs.

Conclusion
The Sassanid art is known to be overwhelmed with luxurious aspects and motifs that are represented in Stucco design, Reliefs, metalwork, and, textiles. However, looking into other artistic features of this period indicates a new and unique medium. To comprehend this topic, we need to study the pottery created during the Sassanid period. We should consider its artistic value and how it is affected by the religious and ritual practices of that time. Vigol is one of the Sassanid sites with a fire temple that is a representation of their influence and power. Potsherds related to this period show the importance of pottery and its decoration. Examining these samples shows that most of them are simple and unglazed with stamped decorations, the variety and abundance of which is remarkable. Also, stamped sherds of vigol pottery is inspired by other artistic motifs of this period, such as heart-shaped motifs. According to the available documents and studies, it can be said that pottery has been a more appropriate cultural material for performing roles than other decorative arts. The comparison of motifs found on Stamped samples shows that this type of decoration was not only in Vigol but also in other important Sassanid sites in Mesopotamia, Iran, and Afghanistan. However, in some cases, the decoration of Stamped in Vigol shows a special variety that distinguishes it from other examples in the Sassanid period. Further studies consisting of archaeological surveys and excavations will add to our knowledge regarding the production and variety of motifs of Stamped potteries.