Saint Isidore was the brother of three saints: Saint Leander (February 27), Saint Fulgentius, and Saint Florentina. Orphaned at an early age, he was educated by his older brother Leander. The range of his knowledge was extensive, and included the study of Hebrew and Greek. He also wrote biographies of biblical figures and other illustrious men.
A prollific writer, Saint Isidore wrote on religious, historical and scientific topics. His ETYMOLOGIES (or ORIGINS) was a compendium of the knowledge of his time, and was used through the Middle Ages. Today, however, his history of the Goths and Vandals is of greater interest. He even composed a monastic Rule, although he was not a monk.
The tireless bishop also composed treatises refuting the Arian and Monophysite heresies. He participated in a council at Toledo in 610, and presided at the second Council of Seville in 618 or 619.
Saint Isidore fell asleep in the Lord in 636, and his holy relics were later transferred to Leon. Dante mentions him in his PARADISO (X, 130).