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What is St. Isidore of Sevilla the patron saint of?

St. Isidore of Sevilla (born c. 560) is considered a patron saint of the Internet, computers, computer users, and programmers. Although he has not been officially declared such by the Vatican, he was popularly claimed as patron of the Internet because of his Etymologiae (Etymologies), a 20-volume encyclopedia of human and divine subjects in which he compiled all human knowledge, akin to a modern computer database.