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In page Diaspora:

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Beginning as early as the 2nd century, the kingdom of Aksum (modern-day Ethiopia) created colonies on the Arabian Peninsula. During the 4th century, Aksum formally adopted Christianity as a state religion, becoming the first to do so[citation needed] along with Armenia. In the 6th century, Kaleb of Axum invaded Himyar (modern-day Yemen) to aid and defend Christians under religious persecution. During these campaigns, several groups of soldiers chose not to return to Aksum. These groups are estimated to have ranged in size from the 600s to mid 3000s.[3]