John MacSeonin Burke (Seán MacSeóinín de Búrca), aka John de Burgo, O.S.A., Archbishop of Tuam 1441 to 1450.
Burke was a member of the Mac Seonin branch of the Bourkes of County Mayo, later anglicised as Jennings. Another notable member of this family was General Charles Edward Jennings de Kilmaine (1751–99).
The History of the Popes comments:
Some of the annalists call him "the Archbishop of Conaught, the son of the Parson, son of Mac Johnin Burke." He died in Galway in the year 1450.
References
John MacSeonin Burke Wikipedia(Text) CC BY-SA