What is the full name of the person whose father-in-law submitted Antioch to Hulagu in 1260?
The Principality of Antioch was one of the earliest Crusader States, founded in 1098 during the First Crusade. At the time of the Mongol advance, it was under the rule of Bohemond VI. Under the influence of his father-in-law, Hethum I, Bohemond too submitted Antioch to Hulagu in 1260. A Mongol representative and a Mongol garrison were stationed in the capital city of Antioch, where they remained until the Principality was destroyed by the Mamluks in 1268. Bohemond was also required by the Mongols to accept the restoration of a Greek Orthodox patriarch, Euthymius, as a way of strengthening ties between the Mongols and the Byzantines. In return for this loyalty, Hulagu awarded Bohemond all the Antiochene territories which had been lost to the Muslims in 1243. However, for his relations with the Mongols, Bohemond was also temporarily excommunicated by Jacques Pantaléon, the Latin Patriarch of Jerusalem, though this was lifted in 1263.Around 1262 or 1263, the Mamluk leader Baibars attempted an attack on Antioch, but the principality was saved by Mongol intervention. In later years the Mongols were not able to offer as much support. In 1264–1265 the Mongols were able to attack only the frontier fort of al-Bira. In 1268 Baibars completely overran the rest of Antioch, ending the 170-year-old principality.
In 1271, Baibars sent a letter to Bohemond threatening him with total annihilation and taunting him for his alliance with the Mongols:
Our yellow flags have repelled your red flags, and the sound of the bells has been replaced by the call: "Allâh Akbar!" ... Warn your walls and your churches that soon our siege machinery will deal with them, your knights that soon our swords will invite themselves in their homes ... We will see then what use will be your alliance with Abagha.
Bohemond was left with no estates except the County of Tripoli, which was itself to fall to the Mamluks in 1289.
Bohemond VI