The buried town of Beta Samati in Ethiopia was once part of the Empire of Aksum, which dominated east Africa for centuries and traded with the Roman Empire
Source:
https://www.newscientist.com/article/2226803-lost-ethiopian-town-comes-from-a-forgotten-empire-that-rivalled-rome/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home