In 1150 he was captured by Zengi 's son Nur ad - Din , and was kept a prisoner in Aleppo until he died in 1159 .
The city was again lost in November , and Joscelin barely escaped .
In 1150 Joscelin was captured by Zengi 's son Nur ad - Din , and was kept a prisoner in Aleppo until Joscelin died in 1159 .
The city was again lost in November , and Joscelin barely escaped .