Here is the correct order of events in which Christianity spread across East Africa:
- Greco Romans settled and spread Christianity
- King Ezana became Christian
- Zagwa rulers carved large churches out of rock
- Christian churches were built along the coast of East Africa
This sequence reflects the historical development of Christianity in East Africa, starting with the influence of Greco-Roman settlers, followed by significant milestones such as King Ezana's conversion, the artistic achievements of the Zagwa rulers, and the establishment of churches along the coast.