Well, there's not much overlap between what's typically described as the 'Viking Age' and the Crusades. To illustrate, the two largest groups of 'Norsemen' who fought in the First Crusade or just afterwards:

• Normans. These were descendants of Viking raiders who had settled in France in the 10th C, including those who had subsequently conquered much of southern Italy. The latter carved out a Norman principality in Antioch but culturally they were essentially French.

• Norwegians. Sigurd I (the Crusader) of Norway led an independent crusade of a few thousand men to the Outremer in 1107, where they participated in the 'mopping up' that followed the First Crusade. But Sigurd was head of an increasingly centralised Norwegian kingdom that was now less a diffuse part of a broad Norse world and more a discrete realm within Christendom. Sigurd himself was just the latest in a line of Christian kings going back a century.

So while there was Norse representation in the early Crusades, it wouldn't be considered 'Viking'. Certainly they weren't the sea raiders of popular imagination.