Leander was born at Cartagena, Spain. St. Isidore and Fulgentius, both bishops, were his brothers, and his sister Florentina is numbered among the saints. He became a monk at Seville and then the bishop of the See.
He was instrumental in converting the two sons Hermenegild and Reccared of the Arian Visigothic King Leovigild. This action earned him the king’s wrath and exile to Constantinople, where he met and became close friends of the Papal Legate, the future Pope Gregory the Great. It was Leander who suggested that Gregory write the famous commentary on the Book of Job called the Moralia.
Once back home, under King Reccared, St. Leander began his life work of propagating Christian orthodoxy against the Arians (those who sustained that the Son is not of the same substance as the Father but was created as an agent for creating the world) in Spain.
The third local Council of Toledo (over which he presided in 589) decreed the consubstantiality of the three persons of the Trinity and brought about moral reforms. Leander’s unerring wisdom and unflagging dedication let the Visigoths and the Suevi back to the true Faith and obtained the gratitude of Gregory the Great.
The saintly bishop also composed an influential Rule for nuns and was the first to introduce the Nicene Creed at Mass. Worn out by his many activities in the cause of Christ, Leander died around 600 and was succeeded in the See of Seville by his brother Isidore. The Spanish Church honors Leander as the Doctor of the Faith.
Adapted by A.J. Valentini from: Online, C. (n.d.). St. Leander of Seville – Saints & Angels. Catholic Online. Retrieved March 3, 2021, from https://www.catholic.org/saints/saint.php?saint_id=706