Isaura Palaea (Greek: Ἴσαυρα Παλαιά, Isaura Palaia, "Old Isaura") or Leontopolis (Λεοντόπολις, "city of Leo") was a Roman and Byzantine era town in southern Turkey. The city has been identified with modern Zengibar Kalesi near Konya.
In antiquity the city was in Isauria (Ἰσαυρία) district of Lycaonia in today's southern Turkey.
Before the Romans the town was a strongly fortified city of the Isaurians, located at the foot of Mt. Taurus. It was besieged by Perdiccas, the Macedonian regent after Alexander the Great's death, the Isaurians set the place alight and let it perish in flames rather than submit to capture.
The area was conquered by the Romans in 75 BC. From 492-496 AD the area was fought over between emperor Anastasius I and the local rebels, in what was to become known as the Isaurian War.
The Seljuq Turks manage to take control of the area in the late 11th century, after the Battle of Manzikert.
The city was the seat of an ancient bishopric and is mentioned in all the Notitiae Episcopatuum of the Byzantine era. In the mid Byzantine period the city bishopric was merged with the older neighbouring bishopric of Isauropolis.