Ancient region, southern Anatolia. Most of it was composed of the Taurus Mountains, which provided refuge for a lawless population that resisted successive conquerors. It was incorporated into the Roman province of Galatia in the early 1st century AD and became part of Lycia and Pamphylia under the emperor Vespasian in AD 74. Diocletian included Pisidia in the diocese of Asia c. 297. During Byzantine times it continued to be a region of revolt. By 1204 the Byzantine Empire had lost control of the region to Turkish invaders.