In the Battle of Saint George, the Byzantines under Andronikos Asen ambush and defeat the forces of the Principality of Achaea, securing possession of Arcadia.

The Battle of Saint George took place on 9 September 1320 between the Latin Principality of Achaea and the forces of the Byzantine governor of Mystras, at the fortress of Saint George in Skorta in Arcadia. As a result of the battle, Arcadia, the heartland of the Morea, came firmly under Byzantine control.

The Byzantine Empire, also known as the Eastern Roman Empire, was the continuation of the Roman Empire centred on Constantinople during late antiquity and the Middle Ages. Having survived the events that caused the fall of the Western Roman Empire in the 5th century AD, it endured until the fall of Constantinople to the Ottoman Empire in 1453. The term 'Byzantine Empire' was coined only after its demise; its citizens used the term 'Roman Empire' and called themselves 'Romans'.

Andronikos Asen was the epitropos of the Byzantine province of the Morea between 1316 and 1322.

The Principality of Achaea or Principality of Morea was one of the vassal states of the Latin Empire, which replaced the Byzantine Empire after the capture of Constantinople during the Fourth Crusade. It became a vassal of the Kingdom of Thessalonica, along with the Duchy of Athens, until Thessalonica was captured by Epirus in 1224. After this, Achaea became the dominant power in Greece, lasting continuously for 227 years and cumulatively for 229.

The Barony of Arcadia was a medieval Frankish fiefdom of the Principality of Achaea, located on the western coast of the Peloponnese peninsula in Greece, and centred on the town of Arcadia, ancient and modern Kyparissia.