Corinthian ruler Hersikrates, in a period of Corinthian expansion to South Italy, Sicily and Ionian Sea. However their position in the Adriatic Sea was still strong in the next few centuries. Historian Theopompus (377-320 BC) informed about the island groups in the Adriatic Sea: Apsartides (Cres and Lošinj), Elektrides (Krk), while all the others were the Liburnian islands - Liburnides, from Zadar archipelago to Ladesta (Lastovo) in the south, including Paros (Hvar). Geographer Scymnus (4th century BC) noted that Greek island of Paros had a namesake in the Adriatic Sea, Liburnian island of Paros (Hvar); this name was later changed to Pharos, according to Strabo (VII, 5). Scymnus specially noted the island group Mentorides (Arba - Rab and Cissa - (Pag). Old Greek sources never noted any Liburnian settlement in the northern coasts, possibly because the ancient mariners had been using only outer island channels for navigation towards the beginning of the Amber Road in the north of Adriatic, evading inner seas which were ruled by Liburnian thallasocracy. Alexandria's librarian Apollonius of Rhodes (295 – 215 BC) yet described the islands, Issa (Vis), Diskelados (Brač) and Pitiea (Hvar) as Liburnian. But by the 1st century AD Pliny the Elder includes in the island group Liburnicae only the archipelagos in Zadar and Šibenik aquatories, Gissa (Pag), Sissa (Sestrunj), Scardagissa (Škarda), Lissa (Ugljan and Pašman), Colentum (Murter), island groups Celadussae (Dugi Otok), Crateae, and several other minor ones, though their municipalities occupied islands to the north, Curycta (Krk), Arba (Rab), Crepsa (Cres), Apsorus (Lošinj). Archaeology has confirmed that the narrow region of the Liburnian ethnic nucleus was at the eastern Adriatic coast between Krka and Raša rivers, in "Classical Liburnia", especially between Krka and Zrmanja rivers, where the material remains of their culture and settlements were the most frequently distributed, while their cities were urbanized at certain degree even in pre-Roman ages. By the material remains it's obvious that they didn't settle the eastern Adriatic coast to the south-east of Krka river; their supremacy on the islands to the south of their ethnic region should not be understood necessarily as their ethnic dominion in the southern Adriatic archipelagos (Hvar, Brač, Vis, Lastovo, etc.), but rather as their organized military-naval region based on the island outposts, by which they maintained control of the navigable route to the south. In the 6th century BC their domination of the Adriatic Sea coasts started to diminish.