An naɗa Coloman Sarkin Croatia a Biograd na Moru a shekara ta 1102. A ƙarni na 13, Thomas the Archdeacon ya rubuta cewa haɗin gwiwar Croatia da Hungary ne sakamakon cin nasara.Duk da haka, ƙarshen karni na 14 na Pacta conventa ya ba da labarin cewa an yi masa rawani ne kawai bayan ya cimma yarjejeniya da manyan jiga-jigan Croatia goma sha biyu, domin Croats suna shirin kare mulkinsu daga gare shi da karfi.Ko wannan takarda na jabu ne ko kuma ingantacciyar madogara ce ta muhawarar masana.A yunƙurin hana ƙawance tsakanin Coloman da Bohemond I na Antakiya, Sarkin Rumawa Alexios I Komnenos ya shirya ɗaurin aure tsakanin ɗansa da magaji, Yahaya, da ɗan uwan ​​Coloman, Piroska, a 1104 ko 1105. Ƙawancen da Daular Rumawa kuma. ya baiwa Coloman damar mamaye Dalmatiya a shekara ta 1105. Bisa ga rayuwar John na Trogir mai albarka, shi da kansa ya umarci dakarunsa da ke kewaye da Zadar, wanda ya fi tasiri a cikin garuruwan Dalmatiya.An ci gaba da kewaye har sai da Bishop John na Trogir ya yi shawarwarin yarjejeniya tsakanin Coloman da 'yan kasar da suka amince da sarautar sarki.Garin Split ma ya mika wuya bayan wani dan lokaci kadan, amma wasu garuruwa biyu na Dalmatiya -Trogir da Šibenik - sun mamaye ba tare da turjiya ba.Rayuwar St Christopher the Martyr kuma ta ce wasu jiragen ruwa na Hungary sun mamaye tsibiran Tekun Kvarner, ciki har da Brač, Cres, Krk, da Rab.Thomas the Archdeacon ya ba da labarin cewa Coloman ya ba kowane garin Dalmatiya nasa "ta'idar 'yanci" don tabbatar da amincinsu.Waɗannan 'yancin sun haɗa da 'yancin 'yan ƙasa na zabar Bishop na garinsu kyauta da kuma keɓe su daga duk wani haraji da ake biya ga sarki.Bayan cin nasarar Dalmatia, Coloman ya ɗauki sabon lakabi - "Sarkin Hungary, Croatia da Dalmatia" - wanda aka fara rubuta shi a cikin 1108.