Alexios Komnenos

http://en.wikipedia.org/wiki/John_Doukas_Komnenos

John Doukas Komnenos (1128-September 1176) was a son of Andronikos Komnenos.[1] Through his father, he was a grandson of Byzantine Emperor John II Komnenos. He was doux (military governor) of Cyprus from 1155 until his death as well as being appointed a protovestiarios in 1148.

Marriage and children John Doukas was married around 1146 to a woman later known as Maria, a Taronitissa,[9] possibly daughter of John Taronites, pansebastos sebastos. The couple had at least two children:

1. Maria (c.1154-1208/1217), married firstly to Amalric I of Jerusalem; from this marriage she had a daughter, the future Isabella I of Jerusalem and then married secondly to Balian of Ibelin, amongst the children produced from this marriage was John of Ibelin, the Old Lord of Beirut
2. Alexios Komnenos (died 1187), led a rebellion against Andronikos I Komnenos but was captured, blinded and imprisoned,[10] died unmarried

http://fmg.ac/Projects/MedLands/BYZANTIUM%2010571204.htm#IoannesKdi...

IOANNES Doukas Komnenos ([1128]-killed in battle Myriokephalon shortly after 17 Sep 1176). ... m ([1146]%29 --- Taronitissa, daughter of [IOANNES] Taronites [III] & his wife --- ([1125/30]-after 1176). ... Ioannes Doukas Komnenos & his wife had two children:

• i) MARIA Komnene (1154-before Oct 1217). ...
• ii) [ALEXIOS Komnenos (-1187). Niketas Choniates records that "Comnenus Alexius, Manuel imperatoris ex fratre nepos" rebelled against Emperor Andronikos[216]. The primary source which confirms his parentage more specifically has not yet been identified, but he may have been the son of Ioannes Doukas Komnenos. He could not have been the son of Ioannes´s brother Alexios, because of the Byzantine convention whereby sons were not normally named after their fathers, and no other son of one of the emperor´s brothers is known to have had sons. With Norman help, he was proclaimed emperor in Thessaloniki. Imprisoned and blinded 7 Nov 1185, he died in prison.]