Costantino Cristiano Luna Pianegonda
Costantino Cristiano Luna Pianegonda was an Italian Franciscan friar and clergyman. He was ordained priest by the Franciscans on 1 July 1934 before being appointed first bishop of Zacapa in the Archdiocese of Guatemala on 30 November 1955. He was enthroned on 6 January 1956 by archbishop Gennaro Verolino, then apostolic nuncio in Guatemala. He resigned on 16 February 1980 and remained a bishop emeritus of the diocese until his death.
