On the death of Archbishop Le Poer Trench in 1839, the Ecclesiastical Province of Tuam lost its metropolitan status and became the united bishopric of Tuam, Killala and Achonry in the Ecclesiastical Province of Armagh.
Following the death of Archbishop Le Poer Trench in 1839, the ecclesiastical province of Tuam was restructured into a single united bishopric that included Tuam, Killala, and Achonry, falling under the authority of the Ecclesiastical Province of Armagh.