Philosopher and Social Anthropologist Prof. Gammachu Magarsaa has so far periodized 9 Gadaa Oromo Governance cycles for the time since 1249BC in which one cycle takes 360 years. We can see as follows: The intricately curved stones of Xayyaa (Tiya) are the marks of the Gadaa governance of 1249BC – 889BC Xayyaa era, and the … Continue reading Oromia: The Intricately Carved Xayyaa (Tiya) Megaliths of Gadaa Oromo Heritage of 1249BC – 889BC