Isidore of Seville
Isidore was archbishop of Seville in Visigothic Spain and is often called the last of the Latin Fathers — the last man of the ancient world to hold, and to pass on, the whole of its learning. Succeeding his brother Leander in the see of Seville, he laboured for some forty years to educate a Spain only lately converted from Arianism, and presided over the great Fourth Council of Toledo in 633. His masterwork, the Etymologies, gathered all that antiquity knew into a single encyclopedia that would be the most-read textbook of the entire Middle Ages.
“O God, Who didst give unto Thy people Thy blessed servant Isidore, to feed them with the bread of eternal life, grant, we beseech Thee, that even as on earth he showed unto us Thy lively word, so in heaven we may worthily be holpen by the succour of his prayers to Thee on our behalf.”
the Collect (Common of Doctors) · Roman Breviary, tr. Bute (1908)