The Republic of Venice feared that Ottoman control of the Balkan peninsula, which included Venetian territories like parts of Morea and Dalmatia, would reduce their influence over the Adriatic Sea, Ionian Sea, and Aegean Sea. The Republic of Genoa, on the other hand, feared that if the Ottomans were to gain control over River Danube and the Turkish Straits, they would eventually obtain a monopoly over the trade routes between Europe and the Black Sea, where the Genoese had many important colonies like Caffa, Sinop, and Amasra. The Genoese also owned the citadel of Galata, located at the north of the Golden Horn in Constantinople, to which Bayezid had laid siege in 1395.[citation needed]