The Turks after devastating the country, destroying Varch Bosna near the site of Serajevo and penetrating into the district of Sala in lower Bosnia, refused this time to content themselves with plunder, and established their first Sandjakate in Bosnia. Hervoja, seeing himself thrown over by the Turks, who found him no longer useful as a cat’s-paw, and deserted by his own adherents, shut himself up in his family castle at Cattaro, and worn with vexation, perhaps remorse, died the same summer. The two Kings, Tvartko and Sigismund, succeeded on their return in gaining a victory over the Turks, slaying the Sandjak Ikach, and freeing Bosnia for a while from the occupation of the Infidel. But the anarchy within continued, and in 1430 culminated in the spectacle of three rival princes, each of them claiming to be King of Bosnia! In 1435 the death of his two rivals left Tvartko III. once more sole king; but shortly after that date the part of his dominions which answers to the modern Herzegovina separates itself from the rest of Bosnia, and forms for a while an independent principality. The County of Chelm, variously designated as the Banat of Zachlumje and the land of Humska, had been originally incorporated in the Banat of Bosnia by the Ban Stephen[94] in 1326. We have seen it exchanged for Primorie with the King of Hungary, and re-annexed by the first King of Bosnia, who granted it as a fief to his brave general Vlatko Hranić. His grandson, who from his birthplace Cosac, was known as Stephen Cosača, or Cosaccia,[95] took advantage of the weakness of Tvartko III. to transfer the immediate suzerainty of his county to the Emperor Frederick IV., who in 1440 created him Duke, or, as his Sclavonic subjects who had borrowed the German word expressed it, _Herzega_, of St. Sava.[96] This, and the further title of ‘Keeper of St. Sava’s Sepulchre,’ he derived from the tomb of the patron saint of Serbia in his monastery of Mileševo. The Herzegovina, or Duchy, as this country now begins to be called,[97] included, besides the old county of Chelm, the coastland district known as Primorie, and extended from the borders of Rascia to the neighbourhood of Zara.[98] Stephen Cosaccia fixed as the seat of his government the important point where the old Roman bridge still spans the river Narenta, and the City of Mostar still looks back to Radivoj Gost, his _Curopalata_ or ‘Mayor of the Palace,’ as its founder.[99]