Andronikos II Palaiologos or Andronicus II Palaeologus (Greek: Ανδρόνικος Β' Παλαιολόγος) (25 March 1259, Constantinople – February 13, 1332, Constantinople), reigned as Byzantine emperor 1282–1328. Andronikos II Palaiologos was the eldest surviving son of Michael VIII Palaiologos and Theodora Doukaina Vatatzina, grandniece of John III Doukas Vatatzes.
Andronikos II Palaiologos sought to resolve some of the problems facing the Byzantine Empire through diplomacy. After the death of his first wife, he married Yolanda (renamed Eirene) of Montferrat, putting an end to the Montferrat claim to the Kingdom of Thessalonica. Andronikos II also attempted to marry off his son and co-emperor Michael IX Palaiologos to the Latin Empress Catherine I of Courtenay, thus seeking to eliminate Western agitation for a restoration of the Latin Empire. Another marriage alliance attempted to resolve the potential conflict with Serbia in Macedonia, as Andronikos II married off his five-year old daughter Simonis to King Stefan Milutin in 1298.
In spite of the resolution of problems in Europe, Andronikos II was faced with the collapse of the Byzantine frontier in Asia Minor. After the failure of the co-emperor Michael IX to stem the Turkish advance in Asia Minor in 1300, the Byzantine government hired the Catalan Company of Almogavars (adventurers from Aragon and Catalonia) led by Roger de Flor to clear Byzantine Asia Minor of the enemy. In spite of some successes, the Catalans were unable to secure lasting gains. They quarreled with Michael IX, and eventually turned on their Byzantine employers after the murder of Roger de Flor in 1305, devastating Thrace, Macedonia, and Thessaly on their road to Latin Greece. There they conquered the Duchy of Athens and Thebes. The Turks continued to penetrate the Byzantine possessions, and Bursa fell in 1326. By the end of Andronikos II's reign, much of Bithynia was in the hands of the Ottoman Turks of Osman I and his son and heir Orhan.
The Empire's problems were exploited by Theodore Svetoslav of Bulgaria, who defeated Michael IX and conquered much of northeastern Thrace in c. 1305-1307. The conflict ended with yet another dynastic marriage, between Michael IX's daughter Theodora and the Bulgarian emperor. The dissolute behavior of Michael IX's son Andronikos III Palaiologos led to a rift in the family, and after Michael IX's death in 1320, Andronikos II disowned his grandson, prompting a civil war that raged, with interruptions, until 1328. The conflict precipitated Bulgarian involvement, and Michael Asen III of Bulgaria attempted to capture Andronikos II under the guise of sending him military support. In 1328 Andronikos III entered Constantinople in triumph and Andronikos II was forced to abdicate. He died as a monk in 1332.
Andronikos II also had at least two illegitimate daughters: