My brief for this chapter was to discuss the nature of thirteenth-century prosopographical evidence from Cyprus and the Crusader states of the SyroPalestinian mainland (Kingdom of Jerusalem, County of Tripoli, Principality of Antioch) and its relevance to Byzantine prosopography. I shall attempt this by dividing the short survey that follows into two distinct parts: first the issues raised by the suggested chronological limits (1204-1261) and the nature of prosopographies will be considered, with particular reference of course to PBW (the Prosopography of the Byzantine World). In the second part the focus will shift onto the source material, the type of evidence it provides, and its inherent strengths and limitations.