What is "hypsistarians"

Hypsistarians, i.e. worshippers of the Hypsistos (, the "Most High" God), is a term appearing in documents dating from around 200 BC to around AD 400, referring to various groups mostly in Asia Minor, ( Cappadocia, Bithynia and Pontus) and on the South Russian coasts of what is today known as the Black Sea.

Some modern scholars identify the group, or groups, with God-fearers, non-Jewish (gentile) sympathizers to Second Temple Judaism.