Based on research by Jerry Delany:
CHRISTENING: Roman Catholic Church Records, St. Augustine Parish Church, Florida, White Baptisms I, 1784-1792, page 210, entry 403. Juan Antonio Magi Canovas, born 8 July 1790. Baptized 11 July 1790. Son of Antonio Canovas and Catalina Mestra, Leon, Isla de Menorca. Godparents: Antonio Mestra and Antonia Segui, both of San Agustin. Priest: Miguel O'Reilly.