Colivet was Commandant of the Irish Volunteers for Limerick City and East Clare, and led the 1916 Easter Rising in Limerick. He was later arrested and
interned for his part in the Rising. In 1918 he was voted on to the Council for Limerick Corporation while he was jailed in
Lincoln prison. Mayor O'Mara stated that the action was "a protest against the way Irishmen had been treated by the Government, who were filling the gaols with men who had the courage of their convictions". He remained an Alderman on the City Municipal (Glentworth and Shannon Wards) until 1925. His cellmate at Lincoln prison was
Éamon de Valera. De Valera, aided by
Michael Collins and
Harry Boland, famously escaped from Lincoln prison in 1919 with the help of a key made by Peter De Loughry.
Election to the First Dáil He was elected as a
Sinn Féin MP for the
Limerick City constituency at the
1918 general election. In January 1919, Sinn Féin MPs refused to recognise the
Parliament of the United Kingdom and instead assembled at the
Mansion House in
Dublin as a revolutionary parliament called
Dáil Éireann. At the official roll call, Colivet was marked "fé ghlas ag Gallaibh" (imprisoned by the foreign enemy). Like many other elected Irish MPs he was interned in a British prison at the time. On 14 April 1921 his treatment at Rathkeale prison was debated in the House of Commons - MPs questioned his cell conditions and if it was appropriate to carry around an elected MP, who was awaiting trial, as a hostage on British Army trucks. English journalist Wilfrid Ewart gives an interesting account of Ireland at that time, including a visit to Rathkeale prison and a meeting with Colivet, who was interned there in April 1921.
Stance on the Anglo-Irish Treaty He was re-elected unopposed at the
1921 elections for the
Limerick City–Limerick East constituency. He opposed the
Anglo-Irish Treaty and
voted against it, stating in the Dáil debate: He was again re-elected unopposed at the
1922 general election as an anti-Treaty Sinn Féin
Teachta Dála (TD) but did not take his seat in the Dáil as he did not recognise the legitimacy of the
Third Dáil. He lost his seat at the
1923 general election. In the Limerick Municipal elections of 1925, he stood for the Republican party in the Abbey and Castle Wards and was elected as a Councillor. In 1926, many Anti-Treaty republicans decided to resume constitutional politics and founded the
Fianna Fáil party. In 1927 they took the Oath of Allegiance and entered the Dáil. Colivet did not join Fianna Fáil as he refused to take the Oath of Allegiance, and soon after he retired from political life. ==Post-political life==