Pirwa was originally worshiped in Kanesh. According to Franca Pecchioli Daddi. he was the principal deity of this city. This view is also supported by John MacGinnis. However, it is commonly assumed Anna fulfilled this role instead. Pecchioli Daddi's proposal relies on the fact that the Old Assyrian texts from Kanesh mention many people bearing theophoric names invoking Pirwa, including members of the local royal family. Only a single document from the site mentions a priest (kumrum) in his service, a certain Hapuala.
