St. Isidore of Seville, Roman Catholic Priest and Doctor of The Church. Isidore was the first Christian writer to try to compile a summa of universal knowledge, in his most important work, the Etymologiae his learning caught fire in Spanish minds and held back the Dark Ages of barbarism from Spain. Feastday April 4
Left: Diagram of the planets, from excerpts of Pliny’s Natural History, France (Fleury), c. 990-1000, Harley MS 2506, f. 53r; Right: Diagram of the planets’ orbits, from Isidore of Seville’s De Natura Rerum, England (St Augustine’s Abbey, Canterbury?), Cotton MS Domitian A I, f. 23v.
Saint Isidore of Seville-- (560 – 04/636) a scholar and, for over three decades, Archbishop of Seville, is widely regarded as the last of the Fathers of the Church, as the 19th-century historian Montalembert put it in an oft-quoted phrase, "The last scholar of the ancient world."