Konstantinos Palaiologinos

• https://en.wikipedia.org/wiki/Constantine_Palaiologos_(son_of_Andronikos_II)

Constantine Doukas Komnenos Palaiologos (Greek: Κωνσταντῖνος Δούκας Κομνηνός Παλαιολόγος; 1278/81–1334/35) was a Byzantine prince of the Palaiologos dynasty, who received the supreme title of Despot and served as provincial governor.

Constantine was the second son of Emperor Andronikos II Palaiologos (r. 1282–1328) and his first wife, Empress Anna of Hungary. He was born sometime between 1278 and 1281. As his father was already a reigning co-emperor alongside Michael VIII Palaiologos, he was styled a porphyrogennetos ("purple-born"), as attested on his seals. In 1294 he was named Despot, the highest court rank in the Byzantine Empire, on the occasion of his first marriage to Eudokia, the daughter of Theodore Mouzalon.

In 1305, he fought in the disastrous Battle of Apros against the Catalan Company. In 1317, he intercepted his half-sister Simonida, the queen-consort of Serbia, who wished to retire to a monastery after the death of her mother, Irene of Montferrat, and handed her over to the Serbs. At about this time he married a second time, again to a Eudokia, but both his marriages were childless. He had one illegitimate son, Michael Katharos. In 1319 he served as governor of Avlona, and in 1321–1322 as governor of Thessalonica. It was in this position that the outbreak of the Byzantine civil war of 1321–1328 found him; in 1322 he was imprisoned by his nephew, Andronikos III Palaiologos, at Didymoteichon. Constantine then became a monk, under the monastic name Kallistos. He died in 1334/35.

http://en.wikipedia.org/wiki/Anne_of_Hungary_(1260-1281)

According to George Pachymeres, the couple had two children:

1. Michael IX Palaiologos (17 April 1277 – 12 October 1320).
2. Constantine Palaiologos, despotes. (c. 1278–1335). Married firstly Eudokia, a daughter of Theodore Mouzalon and a woman of the Kantakouzenos family. Married secondly Eudokia Neokaisareitissa. He also had a mistress, Kathara, who was in the service of his second wife. Constantine was forced to become a monk by his nephew Andronikos III Palaiologos.

• 2.1) Eudokia Palaiologina. Only legitimate daughter of Constantine and Eudokia Neokaisareitissa. John VI Kantakouzenos records her marriage to Demetrios Tsamplakos, megas stratopedarches.
• 2.2) Michael Katharos. Illegitimate son of Constantine and Kathara. A favorite of his paternal grandfather Andronikos II in the later years of his reign.