It is a very confusing time because of the very fractious nature of the Sunni and Shi'ite Muslims and the numerous sultanates across the Holy Land.

It WAS controlled by the Seljuk Turks at the beginning of the Crusades but after the battle outside Antioch (after the Crusaders had captured the city and then besieged inside it in late 1098) but the Egyptian Muslims (the Fatimids) took the city as a result of that defeat outside of Antioch when the Sunni Seljuk's cohesion was completely destroyed.

Beforehand the Sunnis were led by the Abasids who lost Jerusalem to the Fatimids in the early 11th Century (1000s) however the Seljuk Turks took control of the Sunni Caliphate circa 1055 and drove the Fatimids back from Jerusalem and Damascus. Then in 1098 the Fatimids took the territory (again) including Jerusalem.

In short: Yes, it's very confusing because not only do you have the Sunni and Shi'ite Caliphates you also have different dynasties taking over the caliphate which is really, really confusing and it ends up going back and forth constantly.

Also if anyone gets confused by any of Rhiannon's Welsh words just yell (or Google) - I'll tend to stick with [i]bach[/i] which means 'little' literally but is more of a friendly term of affection (or demeaning).