Their territory began after Liburnian Scardona (Skradin), spreading in small region directly to the south of Liburnia, and border ran roughly through the middle of the peninsula which Roman sources called Hyllus.
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In Liburnia, centres such as Nedinium (Nadin), Asseria (Podgrađe, near Benkovac), Iader (Zadar) continued to exist in Roman times, and the Liburnians retained their ethnic distinctiveness under Rome, while the same did not occur on the neighbouring Hyllus Peninsula.