Constantine Palaiologos (half-brother of Michael VIII)

Constantine Palaiologos or Palaeologus () (died 1271) was a Byzantine nobleman and the younger half-brother of the Byzantine Emperor Michael VIII Palaiologos.
Life and career.
Constantine was born ca. 1230, to Andronikos Palaiologos, Grand Domestic of the Empire of Nicaea and his unknown second wife.
The life of Constantine is unknown until 1259, when he was appointed "Caesar" by his elder half-brother, Michael VIII. The following year, he was also created a "sebastokrator". He commanded the Byzantine forces on an unsuccessful campaign against the Latin Principality of Achaea, where his army was routed at the Battle of Prinitza. However, Constantine had already left the region by the time of the major Byzantine defeat at the Battle of Makryplagi in 1263/1264.
Sometime after returning from the campaign against the Principality of Achaea, Constantine became a monk under the name Kallinikos. He died in 1271.
Marriage and family.
Constantine was married c. 1259/60 to Irene Komnene Laskarina Branaina, by whom he seems to have had five children"