 The two communities were somewhat hostile at first, but as the Croats became Christianized this tension increasingly subsided.A degree of cultural mingling soon took place, in some enclaves stronger, in others weaker, as Slavic influence and culture was more accentuated in Ragusa, Spalatum, and Tragurium.In about 925 AD, Duke Tomislav was crowned, establishing the Kingdom of Croatia, and extending his influence further southwards to Zachlumia.