 Roman migration soon followed.In the 6th century Pelješac came under Byzantine rule.Upon the arrival of the Croats, the area of the Neretva (from the northern Herzegovina mountains to Rijeka Dubrovačka) was established by the prince of Zahumlje - same as Neretva, Primorje and Herzegovina, which also belonged to Ston with Rat (Peljesac) and Mljet.