From Ancestry.com: He was about thirty-six years old when he was smuggled into Antioch to marry the nine-year-old Princess Constance. He had to be smuggled in as her mother had other plans for her. He was handsome, vigorous and made himself popular but he was not wise. While he was away from Antioch a Byzantine army lay siege to the city as homage had not peen paid to the Emperor. The citizens were not sure what to do and closed the gates against th e Emperor. Raimund hurried back and was able to enter the city and take over the defence. However, not sure about the situation, he asked the advice of King Fulk in Jerusalem. As Fulk wanted a strong ally in his own battles with the Caliph Zengi, he suggested he should acknowledge the overlordship of the Byzantine Emperor and, when Raimund did, the Emperor graciously withdrew but ordered him to raise the Imperial standard over the citadel to show the world who was in charge.
However, the Franks should have co-operated with each other and the Byza ntine Emperor against Zengi, but petty jealousy and self-interest weakened them. When the Emperor went to fight in Syria, Raimund and Joscelin II of Edessa agreed to join forces. But when the battle ensued, they held back leaving the fighting to the Byzantines who were therefore cheated out of the success which was certain if they had taken part in the fight with the Moslems. Raimund and Joscelin both resented the Emperor's greater power and were determined that the other would gain no advantage from the Emperor. As a result, nothing was achieved and the Emperor returned home.
Due to the hostility and dishonesty which they continued to show the Emp eror, the latter returned in 1142 with an army but died in a hunting accident. They were relieved, but so was Zengi who was now free from a powerful opponent whose death was soon followed by that of King Fulk of Jerusalem. Zengi then besieged Edessa while Joscelin was elsewhere. Joscelin appealed for help to Raimund and the Queen-widow of Jerusalem. The latter sent an army but Raimund, who hated Joscelin, did nothing. Joscelin hoped the city would hold out until the army arrived but Edessa was captured and was the first of the Crusader kingdoms to be destroyed .
After the initial carnage, Zengi regained control over his soldiers and ordered the protection of the local Christians, while all Franks were killed and their women and children sold into slavery. Zengi would probably have done a great deal of damage but, on 14 September 1146, he was murdered by a eunuch whom he had reprimanded for drinking out of his own personal wine glass.
To assist in the defeat of the Moslems, Louis VII of France and his queen arrived with a large army. However, Louis VII was approached by three different princes with three different plans, each wanting to use the king for their own selfish reasons. After an indecisive period, the queen, who was Raimund's niece, urged her husband to listen to Raimund. She pleaded so well that the king became suspicious about the time his queen had spent with her uncle. To the fury of the much more intelligent queen, Louis VII decided to leave immediately for Jerusalem. Although she threatened to stay behind in Antioch and divorce him, Louis VII used force to make her accompany him, keeping her a virtual prisoner.
Louis VII then went to Jerusalem and, with the Queen-widow Melisende, attended a conference at Acre along with most of the crusaders. But Raimund , still furious with Louis VII, refused to attend. By 1149 Louis VII had returned to France while Raimund went to the rescue of one of his castles besieged by Nured-Din. The latter, forewarned of the supposedly super ior army of Raimund, withdrew; but when he became aware that his own arm y was the larger, he returned and surprised the Franks. Raimund wanted t o break his way out but, his army virtually annihilated, was dead by noon . Nured-Din decided to follow an earlier example and Raimund, like his father-in-law before him, had his head cut off and his skull, set in a silver case, sent to the Caliph of Baghdad.