Saint Isidore of Seville is the patron saint of what?

Saint Isidore, who lived in the seventh century, was believed to have written the world's first encyclopaedia, the Etymologies, which included entries on medicine, mathematics, history and theology.

Scholars during the Dark and Middle Ages relied on the Etymologies more than any other textbook. It preserved many fragments of classical learning which otherwise would have been lost, according to The Catholic Encyclopedia.