We mourn the passing of Abbaa Gadaa Professor Asmerom Legesse, the Eritrean scholar whose rigorous work on the Oromo Gadaa system reshaped how the world understands indigenous African governance. Through seminal books including Gadaa: Three Approaches to the Study of African Society (1973) and Oromo Democracy (2000), he framed Gadaa as an Oromo constitutional democratic order with rotating leadership, codified law, and checks and balances. His legacy endures across generations.