The website listed at the end of this message has information on the First Families of the Venetian Republic: The Houses of Crispo, Morosini, Venier, Zeno, Barbaro, Dandalo, Orseolo, Giustiniani, Loredan, Participazio, Contarini, Grimari, Cornaro, Mocenigo, Sommaripa, etc....
http://www.digplanet.com/wiki/Category:Families_of_the_Venet...