Ordained in the diocese of Granada, Spain in 1915. Received a doctorate in theology. Teacher and chaplain at the seminary of Granada, Spain. Parish priest at the Divine Shepherdess church in Motril, Spain where he lived in poverty to help support the local poor, and worked endlessly for his parishioners. During the persecutions he sheltered the Daughters of Charity in his church. Found by anti–Christian forces, he was ordered to blaspheme to show his renunciation of the faith; he refused. Martyr. Martyred in the Spanish Civil War.
- shot on 26 July 1936 in the atrium of the Divine Shepherdess parish church in Motril, Granada, Spain
- “Blessed Manuel Martín Sierra“. CatholicSaints.Info. 8 December 2016. Web. 10 December 2016. <>