For the first two centuries after the settlement, from the early 7th century on, there are almost no historical records about the Serbs, and the region in general, as even in the entire Byzantine Empire almost no contemporary chronicles or historical works survived. But in this period the process of resettling of the Serbs in the central region of the peninsula was finished. They inhabited the narrow valleys in the watersheds of the West Morava, Lim, Drina and Bosna, gravitating to the Morava Valley on the east and the Sava on the north. Certain groups possibly crossed the Dinarides and reached the Adriatic coast, but a closer reading of the "DAI" suggests that Constantine VII's consideration about the Serbian ethnic identity of the population of Pagania, Travunia and Zachlumia is based on Serbian political rule and does not indicate ethnic origin.