1861-2017: the divisive history of abortion
1861: Abortion is made a criminal offence in Ireland under the Offences Against the Person Act.
1983: Referendum on the Eighth Amendment is passed by a two-to-one margin. The resulting Article 40.3.3 in the Constitution guarantees equal status to the lives of a mother and unborn child.
1991: Ireland signs the EU Maastricht Treaty, but gets guarantee its abortion law will not be affected.
1992: X Case begins. High Court grants Attorney General an injunction preventing a 14-year-old girl, pregnant as a result of rape, from travelling to the UK for an abortion. The Supreme Court lifts the injunction - ruling that, if there was a real risk to the mother's life, as distinct to her health, abortion would be lawful. A suicide threat was deemed a real risk to life. Two referendums passed to grant the rights to travel and information. A third amendment to remove suicide as a ground for abortion was rejected.
1997: In the C Case, another raped and pregnant teenager was granted right to an abortion in the UK.
2002: Fianna Fáil proposes referendum permitting abortion to save a mother's life but removing suicide as grounds. Voters reject it.
2010: European Human Rights Court ruled Ireland failed to respect the private life of Ms C.
2012: In response to the European Court of Human Rights ruling, Enda Kenny's government begins a long process of consultation.
2013: The government enacts the 'Protection of Life During Pregnancy Act' which gave legal effect to the 1992 X Case ruling. Abortion is now available where a mother's life is at risk, including from a suicide threat.
June 2017: Leo Varadkar pledges referendum on 1983 abortion provision. Committee of TDs and senators begins preparatory work.