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Leonardo I Tocco (who was count of Cephalonia 1357–1376 and duke of Leukas 1362–1376) was himself the son of Guglielmo II Tocco (governor of Cephalonia 1328–1335) and Margherita Orsini, sister of Nicholas Orsini and John II Orsini, rulers of Epirus and counts of Cephalonia.