Question: When did William Ii Crispo's father die?
Answer: 1397

He was the son of the tenth Duke Francesco I Crispo and wife Fiorenza I Sanudo, Lady of Milos. Francesco I Crispo, Patrizio Veneto (died 1397) was the tenth Duke of the Archipelago through his marriage and the will of Venice. Francesco Crispo was probably born in Verona