What is "cidyessus"

Cidyessus was a city of some importance, west of Ammonia in west-central Phrygia, in the territory of the Setchanli Ova, or Mouse Plain; this large and fertile valley projects far into Phrygia Salutaris, but the city was in Phrygia Pacatiana.

Its site has been determined by an inscription to be modern Küçükhüyük in Turkey, west of Afyonkarahisar. The old native name may have been Kydessos, though it is Kidyessos on its coins.