The installation of Athlone native Bishop Michael Duignan as the Bishop of Galway takes place today.
The current Bishop of Clonfert will take up his new role following mass of Installation at Galway cathedral at 3pm today.
Bishop Duignan will be the principal celebrant and will also preach the homily.
Archbishop Jude Thaddeus Okolo, Papal Nuncio to Ireland and Bishop Brendan Kelly will also be in attendance and will celebrate the mass with Bishop Duignan.
Pope Francis appointed Bishop Michael Duignan, Bishop of Clonfert, to minister simultaneously as Bishop of Galway, Kilmacduagh and Apostolic Administrator of Kilfenora in late February.
The two Dioceses concerned are to be pastorally administered by the one Bishop with the Diocese of Clonfert including parishes in Roscommon.