During these centuries the Serbian state (and influence) expanded significantly. The northern part (modern Vojvodina), was ruled by the Kingdom of Hungary. The period after 1371, known as the Fall of the Serbian Empire saw the once-powerful state fragmented into several principalities, culminating in the Battle of Kosovo (1389) against the rising Ottoman Empire. The Ottomans finally conquered the Serbian Despotate in 1459. The Ottoman threat and eventual conquest saw massive migrations of Serbs to the west and north.