>Accepted numbers for the number of preists killed in the loyalist zone would hardly be beleivable, were they not the result of painstaking research conducted by Antonio Monterro in the late 1950s. According to this research, 6832 members of the Catholic Clergy were massacred, including 13 bishops, 4172 dioscean priests and semenarians, 2364 monks and friars and 283 nuns.
De la Cueva, Julio. “Religious Persecution, Anticlerical Tradition and Revolution: On
Atrocities against the Clergy during the Spanish Civil War.” Journal of Contemporary History, vol. 33, no. 3, 1998, pp. 355–369. JSTOR, JSTOR, www.jstor.org/stable/261121.