Around 406 AD, Saint Mesrob Mashtots was tasked with creating a new alphabet for the Kingdom of Armenia. The Armenians sought to distance themselves from the countries and religions that surrounded (and attempted to conquer) them. Many suggest that Mesrob might have encountered Ethiopian Christians while on pilgrimage to Jerusalem, and came into possession of one of their religious texts. With a Ge’ez bible as his guide, it isn’t unthinkable that Mesrob adopted some of the characters to fit his unfinished alphabet. Both Armenia and Ethiopia were nations that had faced the same problem Mesrob was sent to address – they were the only Christian nations in their regions for years, and were eager to produce the same sort of religious literature.
Source: https://www.thecoli.com/threads/african-culture-proto-ethiopians-may-have-given-armenians-their-first-alphabets.305793/