1956 - Sudan gains independence from joint British-Egyptian rule.
First civil war
1962 - Civil war led by the southern seperatist Anya Nya movement begins with north.
1969 - Group of socialist and communist Sudanese military officers led by Col Jaafar Muhammad Numeiri seizes power; Col Numeiri outlines policy of autonomy for south.
1972 - Government of Sudanese President Jaafar Numeiri concedes a measure of autonomy for southern Sudan in a peace agreement signed in Addis Ababa.
1978 - Oil discovered in Unity State in southern Sudan.
Second civil war
1983 - Fighting breaks out again between north and south Sudan, under leadership of John Garang's Sudanese People's Liberation Movement (SPLM), after Sudanese President Jaafar Numeiri abolishes South Sudan's autonomy.
1988 - Democratic Unionist Party - part of Sudan's ruling coalition government - drafts cease-fire agreement with the SPLM, but it is not implemented.
1989 - Military seizes power in Sudan.
2001 - Sudanese Islamist leader Hassan Al-Turabi's party, the Popular National Congress, signs memorandum of understanding with the southern rebel SPLM's armed wing, the Sudan People's Liberation Army (SPLA). Mr Al-Turabi is arrested the next day.
2002 - SPLA and Sudanese sign agreement on six-month renewable cease-fire in central Nuba Mountains - a key rebel stronghold.
Talks in Kenya lead to a breakthrough agreement between southern rebels and Sudanese government on ending the civil war. The Machakos Protocol provides for the south to seek self-determination after six years.
North-south peace deal
2005 January - North/South Comprehensive Peace Agreement (CPA) ends civil war; deal provides for a permanent ceasefire, autonomy for the south, a power-sharing government involving rebels in Khartoum and a south Sudanese referendum on independence in six years' time.
2005 July - Former southern rebel leader John