To name a few other important people:

)Enrico Dandalo (sp). The Doge who ferried and helped the crusaders of the 4th crusade take Constantinople by sea. The Turkish conquest of Anatolia and Europe were a matter of time thanks to his efforts and their peoples condemned for 500 years of muslim rule.

)Alexius Komnenos who triggered the crusading era (you could also thank Alp Arslan or Romanos Diogenes)

)El cid

)any of the Medici

)The Norman Sicilian Robert Guiscard and his line