He was baptised Mikael Archangelus Joseph in the parish church of Zebbug on 30 September 1737, the son of Bartholomew Xerri and his wife Anne.
Mikael Archangelus Joseph was formally welcomed into the community through a baptism ceremony at the parish church of Zebbug on 30 September 1737, with his parents Bartholomew Xerri and Anne present to witness the occasion.