Final answer:
The largest ethnic group in all of Africa, named after a kingdom that existed in modern-day Nigeria from 1000 to 1800 CE, is the Yoruba people.
Step-by-step explanation:
The largest ethnic group in all of Africa, named after a kingdom that existed in modern-day Nigeria from 1000 to 1800 CE, is the Yoruba people. The Yoruba, together with the Igbo and the Hausa, are the largest of Nigeria's more than 500 ethnic groups.