The European Court of Human Rights is due to rule on whether the Irish Republic's anti-abortion laws violate women's human rights.
The case was brought to the Strasbourg-based court by three Irish women who say their health was put at risk by having to travel abroad for abortions.
Abortion is illegal in Ireland unless the woman's life is in danger.
If the court rules in favour of the three women, Ireland will be obliged to change its laws.
The issue has divided the deeply Catholic nation.
Ireland has become much more liberal and secular in recent years, says the BBC's Mark Simpson in Dublin, but there is still strong opposition to abortion in many quarters.
It is estimated that more than 4,000 Irish women every year have an abortion overseas, most of them in England.
The case was brought to the Strasbourg-based court by three Irish women who say their health was put at risk by having to travel abroad for abortions.
Abortion is illegal in Ireland unless the woman's life is in danger.
If the court rules in favour of the three women, Ireland will be obliged to change its laws.
The issue has divided the deeply Catholic nation.
Ireland has become much more liberal and secular in recent years, says the BBC's Mark Simpson in Dublin, but there is still strong opposition to abortion in many quarters.
It is estimated that more than 4,000 Irish women every year have an abortion overseas, most of them in England.