First military coup topples First RepublicJan 15, 1966Labels: First Republic, Coup PlottersUS HistorianWikipedia
Aguiyi-Ironsi assumes power as military headJan 16, 1966Labels: Johnson Aguiyi-Ironsi, National MilitaryUS HistorianBritannica
July counter-coup begins against Ironsi regimeJul 28, 1966Labels: July Counter-Coup, Northern OfficersWikipediaVanguard
Gowon announces he has assumed controlAug 1, 1966Labels: Yakubu Gowon, Federal GovernmentUS HistorianWikipedia
Bloodless coup ousts Gowon; Mohammed installedJul 29, 1975Labels: Murtala Mohammed, 1975 CoupWikipedia
Dimka coup attempt kills Murtala MohammedFeb 13, 1976Labels: Murtala Mohammed, Bukar SukaWikipediaECES
Obasanjo hands power to civilian President ShagariOct 1, 1979Labels: Olusegun Obasanjo, Shehu ShagariWikipediaECES
Military coup overthrows Shagari; Buhari takes powerDec 31, 1983Labels: Muhammadu Buhari, 1983 CoupWikipediaUPI
Babangida ousts Buhari in palace coupAug 27, 1985Labels: Ibrahim Babangida, Palace CoupWikipediaBritannica
Orkar and 41 others executed for treasonJul 27, 1990Labels: Gideon Orkar, Treason ExecutionsUPIWikipedia
June 12 presidential election held then annulledJun 12, 1993Labels: June 12, 1993 ElectionWikipediaHuman Rights Watch
Shonekan takes office heading Interim National GovernmentAug 26, 1993Labels: Ernest Shonekan, Interim NationalWikipediaWikipedia
Abacha seizes power and ends interim governmentNov 17, 1993Labels: Sani Abacha, 1993 CoupWikipediaWikipedia
Abacha dies; Abdulsalami Abubakar becomes head of stateJun 9, 1998Labels: Sani Abacha, Abdulsalami AbubakarBritannicaWikipedia
Military hands power to elected civilian governmentMay 29, 1999Labels: Abdulsalami Abubakar, Olusegun ObasanjoBritannicaECES