Around 325-350 CE, King Ezana of Aksum converted to Christianity after being tutored by Frumentius, a Syrian Christian who became the first Bishop of Aksum. Ezana declared Christianity the state religion and built churches. His royal inscriptions changed from invoking pagan deities to the Christian God. He minted coins featuring the Christian cross. This made Aksum the first sub-Saharan African state to officially adopt Christianity, establishing the religion's dominance in the Horn of Africa that continues in Ethiopia and Eritrea today.