Ecclesiastical history The
Roman Catholic Diocese of Killala (
Alladenis in Latin) is one of the five
suffragan sees of the
ecclesiastical Province of
Tuam, comprising the north-western part of
County Mayo with the
Barony of Tireragh in
County Sligo. In all there are 22 parishes, some of which, bordering on the Atlantic Ocean, consist mostly of wild moorland, sparsely inhabited. Lewis's Topographical Dictionary sets down the length of the diocese as , the breadth , and the estimated superficies as – of which are in County Sligo and in County Mayo. The foundation of the diocese dates from the time of
Saint Patrick, who placed his disciple
St. Muredach over the church called in Irish Cell Alaid. In a well that still flows close to the town, local suggests that Patrick baptized 12,000 converts on a single day.
French invasion Killala was the site of the first engagement, during the
Irish Rebellion of 1798, to involve the French force of General
Jean Joseph Amable Humbert. On 22 August 1798, Humbert landed at nearby
Kilcummin harbour, with 1,109 French troops, with the objective of supporting the rebellion. Humbert's force seized Killala and advanced to Ballina, which was also captured with little trouble. The force then moved further inland and, on 27 August, it won the
Battle of Castlebar against a larger government force commanded by General
Gerard Lake. The defeat of the government forces at Castlebar caused a panic in Dublin, and the British government sent reinforcements to Ireland. Humbert and his Irish allies were eventually defeated at the
Battle of Ballinamuck in Longford. On 23 September, a government force led by Major-General Eyre Power Trench attacked Killala and ejected the remnants of Humbert's invasion force who were still in the town. The defeat was the last land major engagement of the 1798 rebellion. Killala had remained under rebel control for thirty-two days. == Transport ==