Although the Romans became rulers of the Adriatic by defeating the Ardiaei in 228, it took them two centuries to confirm their rule. The Romans sent their veteran soldiers to settle in Makarska. After the division of the Empire in 395, this part of the Adriatic became part of the Eastern Roman Empire and many people fled to Muccurum from the new wave of invaders. The town appears in the Tabula Peutingeriana as the port of Inaronia, but is mentioned as Muccurum, a larger settlement that grew up in the most inaccessible part of Biokovo mountain, probably at the very edge of the Roman civilisation. It appears as Macrum on the acts of the Salonan Synod of 4 May 533 AD held in Salona (533), when also the town's diocese was created.