Saint Hilarion the Great (†371) was an anchorite who spent most of his life in the desert, according to the example of Anthony the Great. While Anthony is considered to have established Christian monasticism in the Egyptian Desert, Hilarion is considered by some to be the founder of Palestinian monasticism and venerated as a saint by the Orthodox and the Roman Catholic Church. His feastday is commemorated on October 21.
Saint Isidore of Seville (†636) was a Hispano-Roman scholar, theologian, and archbishop of Seville. He is widely regarded as "the last scholar of the ancient world". At a time of disintegration of classical culture, aristocratic violence, and widespread illiteracy, Isidore was involved in the conversion of the Arian Visigothic kings to Chalcedonian Christianity, both assisting his brother Leander of Seville and continuing after his brother's death. His fame after his death was based on his Etymologiae, an etymological encyclopedia that assembled extracts of many books from classical antiquity that would have otherwise been lost. Since the early Middle Ages, Isidore has sometimes been called Isidore the Younger, because of the earlier history purportedly written by Isidore of Córdoba. His feastday is commemorated on 4 April.