The most difficult Catholi­cism riddles

Besides being bishop of Seville for 37 years, St. Isidore wrote many books about grammar, astronomy, geography, history, and theology, and created an encyclopedia, which at the time was deemed very technologically advanced. St. Isidore is the patron saint of technology because of his strive and contribution towards progression and dedication for learning.

The first Pope was St. Peter. His successor was Linus, whose pontificate lasted from 64 to 76.

Construction of the present basilica began on 18 April 1506 and was completed on 18 November 1626, so it was XVI-XVII century.

The Scapular of Our Lady of Mount Carmel (also known as the Brown Scapular) is the habit of the Carmelite Order. According to the Vatican's Congregation for Divine Worship, the Brown Scapular is "an external sign of the filial relationship established between the Blessed Virgin Mary, Mother and Queen of Mount Carmel, and the faithful who entrust themselves totally to her protection, who have recourse to her maternal intercession, who are mindful of the primacy of the spiritual life and the need for prayer.

Pope Francis attended the technical secondary school Escuela Técnica Industrial N° 27 Hipólito Yrigoyen, and graduated with a chemical technician's diploma. He worked for a few years in that capacity in the foods section at Hickethier-Bachmann Laboratory. Before joining the Jesuits, Bergoglio worked as a bar bouncer and as a janitor sweeping floors, and he also ran tests in a chemical laboratory.

The Roman Catholic Church is the world's largest Christian church, with 1.2 billion members worldwide. There are about 600 millions of Protestants and 350 million of Orthodox Church members.