Successor state to the Adal Sultanate, founded when Imam Muhammad Gasa relocated Adal's capital from Harar to the Aussa (Awsa) oasis in the Afar lowlands to escape Oromo pressure on Harar.
Weakened after the Harari broke away to found the separate Emirate of Harar in 1647; around 1734 the Mudaito Afar dynasty under Data Kadafo overthrew the ruling Harla-descended line, ending the Imamate and founding the (already-canonical) Sultanate of Aussa under Mudaito rule.
The atlas holds 2 border frames for Imamate of Aussa — the shape you scrub through changes in 1577 · 1590.
Broad-context fallback (no Aussa-specific monograph found): covers the Adal-successor Muslim polities of the eastern Horn, including the Aussa lowlands, within Ethiopian history. Same title already used for the successor Sultanate of Aussa canonical record, extended here to its Imamate predecessor.
Broad-context fallback covering the Afar and the polities of the Danakil/Awash lowlands that the Imamate occupied.