* No written history: While the Yoruba have a rich oral tradition, they did not develop a written language until relatively recently. This makes pinpointing the exact origins difficult.
* Migration and cultural development: The Yoruba people likely migrated from other regions and their culture evolved over centuries.
* Archaeological evidence: Some archaeological evidence suggests a Yoruba presence in southwestern Nigeria as far back as 9000 BCE, but this is still debated.
Instead of a specific date, it's more accurate to talk about:
* The emergence of the Yoruba civilization: This is often associated with the Ile-Ife city-state, which is believed to have been established around 1000 CE.
* The development of Yoruba culture and language: This process likely occurred over a long period, starting with the migration of their ancestors to the region.
In essence, the Yoruba people and their culture represent a long and complex history. While we may never know the exact moment they "began," their enduring influence and rich cultural heritage is undeniable.