First legislative elections since end of military rule in 1999. Polling marked by delays, allegations of ballot-rigging. President Obasanjo's People's Democratic Party wins parliamentary majority
State of emergency is declared in the central Plateau State after more than 200 Muslims are killed in Yelwa in attacks by Christian militia; revenge attacks are launched by Muslim youths in Kano.
Umaru Yar'Adua of the ruling People's Democratic Party wins the presidential election.
Christmas Eve bomb attacks near central city of Jos kill at least 80 people. Attacks claimed by Islamist sect Boko Haram spark clashes between Christians and Muslims. Some 200 killed in reprisal attacks.
Vice-President Goodluck Jonathan wins presidential elections.
Suicide bomb attack on UN headquarters in Abuja kills 23 people. Boko Haram claims responsibility. Christmas Day Bombing in churches kill about 40 people. President Jonathan declares state of emergency to contain violence by Boko Haram.
Boko Haram launches a series of attacks in northeastern Nigeria, capturing several towns near Lake Chad and running raids into neighbouring Chad and Cameroon in early 2015. It switches allegiance from al-Qaeda to the Islamic State group.
Nigeria, Chad, Cameroon and Niger form military coalition and push Boko Haram out of all towns and back into Sambisa Forest.
Muhammadu Buhari wins the presidential election, becoming the first opposition candidate to do so in Nigeria's history.
There is a big stay-at-home protest in favour of independence for the south-east marks 50 years since the independent republic of Biafra was declared, sparking a devastating civil war.