Biafra: Polity Style: 1967-1970
| 30 May 1967 | Eastern Nigeria is declared an independent sovereign state under the name of the Republic of Biafra in accordance with a proclamation issued on 30 May 1967 by the Military Governor of Eastern Nigeria (Biafra Proclamation of Republic, pp. 15-16) |
| 30 May 1967 - 15 Jan 1970 | Republic of Biafra |
| 15 Jan 1970 | the polity ceased to exist following a mililtary defeat |