Oromos controlled the Abbisinyan empire. The courts of Gondor once spoke Afan Oromo. The Wallo Oromo including the Rayya were really powerful. And at one point in life, we were heavily nomadic and travelled far.
It’s sad though, the Rayya of today don’t really speak Afan Oromo. Only the elders do, and it’s slowly dying with this clan. Other Wallo clans have also gone through the same fate but instead speak Amharic. Most of the Muslim Wallo “Amharas” are Wallo Oromo from the Qabo, Haimano, Yejju and other subclans.