Historical overview
Sri Lanka, known as Ceylon during British colonial rule, has a long history of kingdoms, maritime trade and cultural exchange. Portuguese influence expanded along the coast from the early sixteenth century, followed by Dutch control of coastal areas. Britain took control of the island in stages and consolidated colonial administration in the nineteenth century.
Ceylon gained independence on 4 February 1948 as a dominion within the Commonwealth. The first post-independence governments operated under a parliamentary system. The 1972 Constitution transformed the country into a republic and replaced the name Ceylon with Sri Lanka. A new constitution in 1978 introduced an executive presidency.
Post-independence political history has been shaped by debates over language, citizenship, ethnic identity, power-sharing and the relationship between the central government and minority communities. The 1956 Official Language Act, commonly associated with the “Sinhala Only” policy, became a major turning point in language politics. Disputes and violence deepened over subsequent decades.
The armed conflict between the Sri Lankan state and the Liberation Tigers of Tamil Eelam (LTTE) escalated into full-scale war in 1983. The conflict lasted nearly 26 years and ended militarily in May 2009. The final stages of the war and alleged violations by multiple parties remain subjects of serious international scrutiny and domestic debate. A historical archive should distinguish documented events, allegations, official positions and findings of independent investigations.
Sri Lanka has also experienced major democratic and constitutional developments, including the 1994 political transition, the 2001 ceasefire process, the 2015 change of government and constitutional reform, and the mass protest movement of 2022 that led President Gotabaya Rajapaksa to resign.
The National Archives of Sri Lanka preserves important constitutional and state records, including materials relating to the transition to republican government in 1972. Sri Lanka National Archives
Key historical timeline
- 1505Portuguese presence begins on the island’s coast.
- 1658Dutch control replaces Portuguese power in coastal areas.
- 1796British take control of Dutch-held coastal territories.
- 1815Kandyan Convention brings the Kingdom of Kandy under British rule.
- 1833Colebrooke–Cameron reforms reorganise colonial administration.
- 1931Donoughmore Constitution introduces universal adult franchise.
- 1948Ceylon becomes independent on 4 February.
- 1949Citizenship legislation excludes many people of Indian Tamil origin from citizenship and electoral participation.
- 1956Official Language Act establishes Sinhala as the sole official language.
- 1972Ceylon becomes the Republic of Sri Lanka; a new constitution is adopted on 22 May.
- 1978New Constitution establishes an executive presidency.
- 1983Anti-Tamil violence and escalation of the civil war.
- 1987Indo-Sri Lanka Accord signed; Indian Peace Keeping Force deployed.
- 2002Government and LTTE sign a ceasefire agreement.
- 2009War ends with the defeat of the LTTE; allegations concerning the final phase remain contested and investigated.
- 2015Political transition and constitutional reform initiatives.
- 2022Nationwide protest movement; President Gotabaya Rajapaksa resigns.Important historical documents to digitiseDonoughmore Commission Report and constitutional records.Ceylon Independence Act 1947.Citizenship Act No. 18 of 1948 and subsequent citizenship legislation.Official Language Act No. 33 of 1956.Constitution of the Republic of Sri Lanka 1972.Constitution of the Democratic Socialist Republic of Sri Lanka 1978 and amendments.Indo-Sri Lanka Accord, 29 July 1987.Ceasefire Agreement, 22 February 2002.Lessons Learnt and Reconciliation Commission report.Parliamentary records and official documents relating to the 2022 political transition.
Archive notes
Archive and research links
Department of National Archives of Sri Lanka – national archival institution.
National Archives – Becoming a Republic – historical account and archival material relating to the 1972 Constitution.
Parliament of Sri Lanka – parliamentary records and constitutional resources.
Editorial note: The civil war must not be reduced to a single narrative. Include the experiences of Tamil, Sinhala and Muslim communities, displacement, disappearances, civilian harm, armed-group abuses, state conduct, peace efforts and post-war accountability debates. Attribute casualty estimates and legal conclusions to the specific institutions that produced them.