It was only during the Goryeo Dynasty during King HyeonJong's reign when trade with Persia was officially recorded in Korean history. But in academic circles, it is presumed that both countries had active cultural exchanges during the 7th century Silla era which means the relationship between Korea and Iran began more than 1,500 years ago. "In a history book written by the Persian scholar Khurdadbid, it states that Silla is located at the eastern end of China and reads 'In this beautiful country Silla, there is much gold, majestetic cities and hardworking people. Their culture is comparable with Persia'. "Samguk Sagi"— the official chronicle of the Three Kingdoms era, compiled in 1145—contains further descriptions of commercial items sold by Middle Eastern merchants and widely used in Silla society. The influence of Iranian culture was profoundly felt in other ways as well, most notably in the fields of music, visual arts, and literature. The popularity of Iranian designs in Korea can be seen in the widespread use of pearl-studded roundels and symmetrical, zoomorphic patterns.