Buganda, I believe! Hope I can help!
Explanation:
Slavery in ancient Rome played an important role in society and the economy. Besides manual labor, slaves performed many domestic services, and might be employed at highly skilled jobs and professions. Accountants and physicians were often slaves. Slaves of Greek origin in particular might be highly educated.
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Slavery in ancient Rome - Wikipedia
There were three major elements were formed during the European civilization, these are Christian Church, Roman Legacy, and Germanic People. It was formed through the convergence.