qnli question: What was John Cabot's sons first name? sentence: Sebastian Cabot declares in a handwritten Latin text in his original 1545 map, that the St. John's earned its name when he and his father, the Venetian explorer John Cabot became the first Europeans to sail into the harbour, in the morning of 24 June 1494 (against British and French historians stating 1497), the feast day of Saint John the Baptist.