D.Jerónimo Osório da Fonseca (1506 – 20 August 1580) was a Portuguese Roman Catholic humanistbishop, historian and polemicist. An extensive notice of his life and thought (''Vita'') was written by his nephew, a canon of Évora also named Jerónimo Osório, to introduce his edition of his uncle's ''Complete Works'' (dedicated to King Philip I of Portugal) published in 1592.
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