Surukin Konstantin, John IV Laskaris, an tsige shi kuma ya makantar da shi daga tsohon majiɓincinsa kuma mataimakinsa, Michael VIII Palaiologos , kafin ƙarshen 1261. Sojojin Michael VIII sun mamaye Constantinople a cikin Yuli, don haka juyin mulkin ya sa shi shi kaɗai ne mai mulkin daular Byzantine da aka maido.Sake haifuwar daular ta sauya alakar gargajiya tsakanin masu iko da yankin Balkan.Bugu da ƙari, matar Konstantine ta yanke shawarar ɗaukar fansa game da yankan ɗan'uwanta kuma ta rinjayi Konstantine ya juya wa Michael.Mitso Asen, tsohon sarki, wanda har yanzu yake rike da kudu maso gabashin Bulgaria , ya kulla kawance da Rumawa, amma wani mai martaba mai karfi, Jacob Svetoslav, wanda ya mallaki yankin kudu maso yammacin kasar, ya kasance mai biyayya ga Konstantine.Da yake amfana daga yaƙi tsakanin Daular Byzantine, Jamhuriyar Venice , Achaea da Epirus, Konstantine ya mamaye Thrace kuma ya kama Stanimaka da Philippopolis a cikin kaka na 1262. An kuma tilasta Mitso ya gudu zuwa Mesembria (yanzu Nesebar a Bulgaria).Bayan Konstantine ya kewaye garin, Mitso ya nemi taimako daga Rumawa, yana ba da damar mika musu Mesembria don musanyawa da kadarorin da ke cikin Daular Rumawa.Michael VIII ya karɓi tayin kuma ya aika Michael Glabs Tarchaneiotes don taimakawa Mitso a 1263.Sojojin Rumawa na biyu sun kutsa kai cikin Thrace suka kwato Stanimaka da Philippopolis.Bayan kwace Mesembria daga Mitso, Glabas Tarchaneiotes ya ci gaba da yakin neman zabensa tare da Bahar Black ya mamaye Agathopolis, Sozopolis da Anchialos.A halin da ake ciki, rundunar sojojin Byzantine ta karbe iko da Vicina da sauran tashoshin jiragen ruwa a yankin Danube Delta.Glabas Tarchaneiotes ya kai hari ga Yakubu Svetoslav wanda kawai zai iya tsayayya da taimakon Hungary , don haka ya yarda da suzerainty Béla IV.