His most outstanding work is the Etymologies (around 634), a monumental encyclopedia that covers various fields of knowledge, such as theology, history, art, law, grammar, cosmology, and natural sciences. This work saved much of the ancient knowledge from oblivion and was fundamental for medieval education. Additionally, he completed the Mozarabic missal and breviary, and presided over important councils such as the Second Council of Seville (619) and the Fourth Council of Toledo (633), where he promoted the creation of cathedral schools for the training of clergy.
Saint Isidore was canonized in 1598 and declared a Doctor of the Church in 1722. He is venerated as the patron saint of historians, philosophers, philologists, and, curiously, of the Internet, due to his work in compiling and transmitting knowledge.
San Isidoro De Sevilla Books
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