The coins contain Roman iconography: on the obverse, there is an eagle standing on a scepter and holding a wreath in their claw (inspired by the silver denarii issued by Pomponius Rufus); the reverse contains three men dressed in togas, two of them holding an axe on the shoulder (possibly inspired by the silver denarii issued by Junius Brutus in 54 BC).
Due to the lack of written information regarding the Dacians' history, many important names related to their civilization remain either unknown or controversial. The controversy regarding the name of this king was prompted after the discovery of golden coins inscribed with the word KOSON in Greek characters. Such coins were discovered in great numbers in Transylvania and the discovery captured the attention of writers starting the 16th century. Thus, there are comments from Erasmus of Rotterdam in 1520 and Stephanus Zamosius (István Szamosközy) in 1593.
Coins inscribed KOSON were discovered in several large stashes in Transylvania. The first group was discovered in 1543, and contained several thousands coins and objects made of gold. It was rumored that this stash was revealed in a bolted chamber under the river Strei, identified as the river Sargetia, and also mentioned by Dio Cassius. Further research disproved this, and placed the treasure in one of the Dacian castles in the Orăştie mountains, probably in Sarmisegetusa.