Joined the Claretians in 1907. Studied at the college of Alagón, then in Cervera. Ordained in 1915 in Zaragoza, Spain. Taught at Aranda de Duero. Noted preacher in Calatayud, Cartagena and Barbastro. Martyred in the Spanish Civil War.
- “Blessed Nicasio Sierra Ucar“. CatholicSaints.Info. 7 August 2015. Web. 10 December 2016. <>