Beyond Rome's Borders: The Enduring Kingdoms of the Cross. In 330 AD, King Ezana of Ethiopia declared Christianity its National religion. For comparison, it took another fifty years for Christianity to become the official religion of the Roman Empire. The Aksumite Empire (Ethiopia & Eritrea One of the world's earliest Christian states, Ethiopia developed a unique and powerful expression of the faith, deeply integrated with its national identity. identity. Its traditions connect directly to the O