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.
The death of Archbishop Le Poer Trench in 1839 led to the transformation of the Ecclesiastical Province of Tuam into a unified bishopric encompassing Tuam, Killala, and Achonry, which was under the jurisdiction of the Ecclesiastical Province of Armagh.