Heir to his father Ferdinand I's Kingdom of Naples, Alfonso held the dukedom of Calabria for most of his life. In the 1480s Alfonso commanded the Neapolitan forces in Tuscany in 1478-79, against the Ottoman Empire in Apulia in 1480-81, and against the Republic of Venice in 1484. In 1486 Alfonso's repressive conduct towards the Neapolitan nobility prompted a revolt; the violent excesses of suppressing this uprising further discredited Alfonso and King Ferdinand. Under Alfonso's patronage the city of Naples was remodelled with new churches, straightened roads, and an aqueduct supplying fountains.