[3] Diego Deza Tello was born in Seville, Spain.
[4][5] On 30 April 1554, he was appointed during the papacy of Pope Julius III as Bishop of Islas Canarias.
[3][4][5] On 26 April 1566, he was appointed during the papacy of Pope Pius V as Bishop of Coria.
[2][4][5] On 11 September 1577, he was appointed during the papacy of Pope Gregory XIII as Bishop of Jaén.
[1][4][5] He served as Bishop of Jaén until his death on 13 September 1579 in Seville, Spain.