Christianity in Ethiopia dates to the 1st century AD. It is considered to be the first nation in the world to accept Christianity and this long tradition makes Ethiopia unique amongst sub-Saharan African countries.
Christianity in Ethiopia is divided into several groups.
The largest and oldest is the Ethiopian Orthodox Tewahedo Church.Ethiopia and especially the Ethiopian Orthodox Church use the old Julian calendar, celebrating Christmas on January 7th.The Ethiopian Orthodox Church's celebration of Christ's birth is called Ganna.