Around 550, the city was unsuccessfully besieged by Totila, king of the Ostrogoths. At a later date it became a part of the Byzantine Empire. Around 841, the Republic of Venice sent a fleet of 60 galleys (each carrying 200 men) to assist the Byzantines in driving the Arabs from Crotone, but it failed. About 870, it was sacked by the Saracens, who put to death the bishop and many people who had taken refuge in the cathedral but were not able to occupy the city. Over a hundred years later, Otto II, Holy Roman Emperor, mounted a campaign in southern Italy to reduce the power of the Byzantines. Later on Crotone was conquered by the Normans. In 1806, it was occupied and sacked by the British, and later on by the French. Thereafter it shared the fate of the Kingdom of Naples—including the period of Spanish rule of which the 16th-century castle of Charles V, overlooking modern Crotone, serves as a reminder—and its successor, the Kingdom of the Two Sicilies, which was conquered by the Kingdom of Sardinia in 1860 and incorporated into the new Kingdom of Italy in 1861.