The Catholic Saint Isidore of Seville (c. 560 - April 4, 636), Bishop of Seville, gained fame not only for his piety, but also for his love of science. He is the author of one of the first books on etymology, the first to introduce the works of Aristotle in Spain, was a reformer and a man of broad views.
Saint Isidore is considered one of the last ancient Christian philosophers, and also the last of the fathers of the great Latin Church. Some historians call Saint Isidore the most educated person of his time, having a significant impact on learning in the Middle Ages.
As indicated above, Isidore of Seville is the author of the 20-volume work "Etymology" (Etymologiae). It was, in fact, the world's first encyclopedia. In it, in order to explain the meaning and origin of words, a huge amount of material was collected, covering the entire amount of knowledge of the era.

Saint Isidore is considered the patron saint of pupils and students, and in 2003, Pope John Paul II named Saint Isidore also the patron saint of computer and Internet users.

The Catholic Church chose him as the patron of the Internet, based primarily on the fact that the World Wide Web is a huge treasury of practical and theoretical human knowledge.
Tireless webmasters and Internet developers also celebrate their professional holiday today. This holiday is still unofficial, but every year it becomes more and more popular. And the date of the calendar - April 4 - "404" - creates an excellent prerequisite for strengthening the traditions of celebrating this day.