 It was on Leuke, in one version of his legend, that the hero Achilles was buried (to this day, one of the mouths of the Danube is called Chilia).Old Romanian folk songs recount a white monastery on a white island with nine priests.Between the late 14th and late 19th centuries, the Ottoman Empire competed first with the Kingdom of Serbia, Second Bulgarian Empire, Kingdom of Hungary, Principality of Wallachia, Principality of Moldavia and later with the Austrian Habsburgs, Polish–Lithuanian Commonwealth, and Russian Empire for controlling the Danube (Turks call it "Tuna"), which became the northern border of the Ottoman Empire for centuries.