Yemen/Axum

King Yusuf As'ar Yathar of Yemen had been persecuting Christians since 523, King Kaleb of Axum who ruled over a Christian state responded by sending a force to Yemen in 525.This force was supported by the Byzantine Empire which Axum had gained ties with politically and religiously when Axum became Christian in the 4th century .Victorious Kaleb was able to take control and keep it until 570 when the Sassanids arrived.