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.
By his first marriage to Giovanna Torelli he had one son, Pietro Tocco, seneschal of Robert of Taranto and Count of Martina.
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Guglielmo was born the son of Pietro Tocco, a notary in Melfi, in the Angevin Kingdom of Naples.
Guglielmo Marconi | Tocco da Casauria | James Tocco | Guglielmo Oberdan | Guglielmo Cavallo | Carlo I Tocco | Tocco family | Theodora Tocco | Guglielmo Vaccaro | Guglielmo Tocco | Guglielmo Ratcliff | Guglielmo Plüschow | Guglielmo Picchi | Guglielmo Massaia | Guglielmo Libri Carucci dalla Sommaja | Guglielmo Achille Cavellini |