Intermittently, whenever the power of Byzantium or of Bulgaria waned, some Serb princeling would try to form a political state on a more ambitious scale, but the fabric always collapsed at his death, and the Serbs reverted to their favourite occupation of quarrelling amongst themselves. Such wore the attempts of Časlav, who had been made captive by Simeon of Bulgaria, escaped after his death, and ruled over a large part of central Serbia till 960, and later of Bodin, whose father, Michael, was even recognized as king by Pope Gregory VII; Bodin formed a state near the coast, in the Zeta river district (now Montenegro), and ruled there from 1081 to 1101. But as a rule the whole of the country peopled by the Serbs was split into a number of tiny principalities always at war with one another. Generally speaking, this country gradually became divided into two main geographical divisions: (1) the _Pomorje_, or country _by the sea_, which included most of the modern Montenegro and the southern halves of Hercegovina and Dalmatia, and (2) the _Zagorje_, or country _behind the hills_, which included most of the modern Bosnia, the western half of the modern kingdom of Serbia, and the northern portions of Montenegro and Hercegovina, covering all the country between the _Pomorje_ and the Save; to the north of the _Pomorje_ and _Zagorje_ lay Croatia. Besides their neighbours in the east and south, those in the north and west played an important part in Serbian history even in those early days.