Sri Lanka
32 events, 1827 to 2023; 3 marked as turning points.
1827
Recruitment of Tamil labourers for Ceylon plantations begins
Labourers from the Tirunelveli, Tiruchi, Madurai and Tanjore areas were recruited for British coffee estates in Ceylon.

1849
Arumuka Navalar receives his title at Thiruvaduthurai
Travelling to Madras to acquire a printing press, Jaffna scholar Arumuka Pillai received the title Navalar from the Thiruvaduthurai Adheenam.

1879
Death of Shaiva reformer Arumuka Navalar
Arumuka Navalar, the Jaffna scholar who revived Shaiva Tamil learning in Sri Lanka and Tamil Nadu and printed early Tamil classics, died.

1906
V. O. Chidambaram Pillai founds the Swadeshi Steam Navigation Company
To compete with British lines on the Tuticorin-Colombo route, V. O. Chidambaram Pillai registered an Indian-owned shipping firm.

1914
The Pamban Bridge, India's first sea bridge, opened, linking Rameswaram on Pamban Island to the mainland by rail.

1948
Ceylon Citizenship Act leaves Indian Tamils stateless
Passed soon after Ceylon became independent, a citizenship law shut out most Indian Tamil plantation workers, descendants of migrants from the Madras Presidency.
1964
Sirima-Shastri Pact on people of Indian origin in Ceylon
India and Ceylon agreed that 525,000 stateless people of Indian origin, mostly Tamil plantation workers, would be repatriated to India.

Rameswaram cyclone destroys Dhanushkodi
Pamban Island was hit by a super cyclonic storm whose surge drowned the town of Dhanushkodi and killed many people.

1974
Sirima-Gandhi Pact on stateless persons of Indian origin
India and Sri Lanka agreed on the future of the 150,000 persons of Indian origin whose status had been left open by the 1964 Sirima-Shastri Pact.

India recognises Sri Lankan sovereignty over Katchatheevu
Under the Indo-Sri Lankan Maritime Agreement, India accepted Katchatheevu island in the Palk Strait as Sri Lankan territory.

1976
India and Sri Lanka sign the 1976 maritime agreement
A further agreement on the maritime boundary restricted fishermen of each country from fishing in the other's exclusive economic zone.

1983
Black July and the arrival of Sri Lankan Tamil refugees
Anti-Tamil pogroms in Sri Lanka in July 1983 sent the first large wave of Sri Lankan Tamil refugees to Tamil Nadu.

1984
Meenambakkam airport bomb blast
A bomb exploded at Meenambakkam airport in Madras, killing several people.
1985
Tamil Eelam Supporters Organisation (TESO) formed
TESO was formed in Tamil Nadu to mobilise support for Sri Lankan Tamils, with M. Karunanidhi among its leaders.
1987
Operation Poomalai: Indian airdrop over Jaffna
Indian Air Force transport planes dropped relief supplies over the besieged city of Jaffna, halting a Sri Lankan army offensive against the Tamil militants.
An accord between India and Sri Lanka on the Tamil issue led to the dispatch of the Indian Peace Keeping Force to the island.
1990
Indian Peace Keeping Force withdraws from Sri Lanka
In March 1990 the final contingents of the Indian Peace Keeping Force, deployed under the 1987 accord, departed from Sri Lanka.

EPRLF leader K. Pathmanabha killed in Madras
EPRLF leader K. Pathmanabha and others were shot dead by gunmen in a Kodambakkam flat in Madras, in killings attributed to the LTTE.
1991
DMK government dismissed under Article 356
The Chandra Shekhar government dismissed the Karunanidhi ministry, citing law and order concerns linked to LTTE activity, and imposed President's rule.
Assassination of Rajiv Gandhi at Sriperumbudur
Former Prime Minister Rajiv Gandhi was killed by an LTTE suicide bomber at an election rally in Sriperumbudur.

1998
TADA court sentences 26 to death in the Rajiv Gandhi assassination case
A designated TADA court at Poonamallee sentenced all 26 accused on trial to death for the conspiracy to assassinate Rajiv Gandhi.
1999
Supreme Court verdict in Rajiv Gandhi assassination case
The Supreme Court upheld the convictions of seven accused in the Rajiv Gandhi assassination case and acquitted the other 19 sentenced by a TADA court.
2002
MDMK leader Vaiko was arrested under the Prevention of Terrorism Act for a speech supporting the LTTE and spent over a year and a half in jail.

2005
Sethusamudram Shipping Canal Project inaugurated
Prime Minister Manmohan Singh launched work on a shipping canal between India and Sri Lanka, a project later stalled by the Ram Setu dispute.

2009
Self-immolation of K. Muthukumar
Journalist K. Muthukumar set himself on fire in Chennai in protest against the killing of Tamil civilians in the Sri Lankan war.
Police and lawyers clash in the Madras High Court
A police action against lawyers on the Madras High Court campus led to an inquiry by former Supreme Court judge B. N. Srikrishna.

End of the Sri Lankan civil war
The Sri Lankan army defeated the LTTE, ending a 26-year war that had deeply affected Tamil Nadu's politics.

2011
India protests Sri Lankan Navy attacks on Tamil Nadu fishermen
India formally protested to Sri Lanka over alleged Sri Lankan Navy attacks on Indian fishermen in the Palk Strait.
2013
Student protests over Sri Lankan Tamils
Colleges were shut after students throughout Tamil Nadu protested over alleged war crimes against Sri Lankan Tamils.

India's Prime Minister skips CHOGM in Colombo after Tamil Nadu pressure
After a unanimous Tamil Nadu Assembly resolution, Prime Minister Manmohan Singh stayed away from the Commonwealth summit in Colombo.
2014
Tamil Nadu parties oppose Rajapaksa's invitation to Modi's swearing-in
Sri Lankan President Mahinda Rajapaksa's attendance at Narendra Modi's swearing-in drew opposition from parties across Tamil Nadu.
2023
Passenger ferry between Nagapattinam and Kankesanthurai begins
A high-speed passenger ferry began sailing between Nagapattinam in Tamil Nadu and Kankesanthurai in Sri Lanka's Jaffna district.