St. Isidore, who succeeded his brother St. Leander as Archbishop of Seville, was one of the great bishops of the seventh century. He was proficient in all brances of knowledge and was regarded as one of the most learned men of his time; with Cassiodorus and Boethius he was one of the thinkers whose writings were most studied in the Middle Ages, St. Isidore died in 636. Pope Innocent XIII canonized him in 1722 and proclaimed him a Doctor of the Church.

St. Isidore of Seville
Isidore, archbishop of Seville and brother of the saintly Bishop Leander, ranks as the most outstanding person in the Church of Spain during the seventh century. Because of the singular holiness of his life, he was idolized by the people. Wherever he appeared, throngs gathered about him. "Some came to see the miracles that he performed in the name of the Lord. The sick came to be freed from their sufferings, for the power of God emanated from him and he would heal them all" (Bollandists: April 1, 340).