Nigerian Republic may refer to one of several republican periods in Nigeria’s constitutional history since Nigeria became the Federal Republic of Nigeria in 1963: First Nigerian Republic (1963–1966), the first republican constitutional government of Nigeria, ended by the January 1966 military coup d’état Second Nigerian Republic (1979–1983), the civilian presidential republic established after military rule, ended by the December 1983 military coup d’état Third Nigerian Republic (1992–1993), partially implemented republican transition under the 1989 Constitution Fourth Nigerian Republic (1999–present), the current republican constitutional order, established under the 1999 Constitution