Constantine XI Palaiologos
Carlo II was the son of Leonardo II Tocco, the younger brother and co-ruler of Carlo I Tocco, count of Cephalonia and Zante, duke of Leukas, and ruler of Epirus. In 1424 Carlo II and his sisters were adopted by their uncle Carlo I. Carlo II's sister Maddalena Tocco married the future Byzantine Emperor Constantine XI Palaiologos in 1428, but died in 1429.