[2][3] Diego Merino was born in Baeza, Spain in 1570 and ordained a priest in the Order of the Brothers of the Blessed Virgin Mary of Mount Carmel.
[3] On 20 November 1623, he was appointed during the papacy of Pope Paul V as Bishop of Montepeloso.
[2][3] On 26 November 1623, he was consecrated bishop by Giovanni Garzia Mellini, Cardinal-Priest of Santi Quattro Coronati with Alessandro Bosco, Bishop of Gerace, and Tommaso Ximenes, Bishop of Fiesole, serving as co-consecrators.
[3] On 24 August 1626, he was appointed during the papacy of Pope Urban VIII as Bishop of Isernia.
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