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Ireneo Affò (born Davide, 10 December 1741 – 14 May 1797) known in Italy as Irenaeus, was an Italian art historian, writer, and numismatist belonging to the Order of Friars Minor Observant, or Franciscan friar.
Affò was born in Busseto in the province of Parma, in the region of Emilia-Romagna. Observing his early inclination for drawing and poetry, Affò's father encouraged him to study in the workshop of the painter and sculptor, Pietro Balestra. After a short time, Affò began pursuing studies in fine arts, demonstrating abilities in the writing.
In his youth, Affò entered the Franciscan order. He continued to pursue his writing, which included poetry. He began to cultivate the study of learning, conducting extensive historical research of Italy and the surrounding area.
Ferdinand, Duke of Parma sent Affò to serve as a professor of philosophy at Guastalla in 1768, where he oversaw the publication of two ancient codices, including Angelo Poliziano's Orpheus, and the newly discovered archive of the Holy Spirit in Reggio Emilia. He then edited the critical edition of poetic works of St. Francis of Assisi. His major work in the literary field is still represented by the first five volumes of Memoirs of writers and scholars of Parma (1789 – 1797). While at Guastalla, Affò wrote his History of the city and duchy of Guastalla. He wrote also, History of Parma, until 1346, as well as other works connected with the ancient history of Italy. Affò's writing became highly respected throughout Italy.
In 1778, Affò was recalled to Parma to become deputy librarian for the court. In 1785, he became director of the Palatine Library in that city, and later became historiographer of the Journal of the Duchy and honorary Professor of History at the university. While his writing covered a wide variety of subjects, his research was uncannily accurate and valued at the library. In 1792, Affò began publishing the four volumes of the History of Parma.
He died at the age of 56, in the convent of Busseto, when he contracted typhus fever. He left a manuscript History of Peter Louis Farnese. Girolamo Tiraboschi, an Italian literary critic and historian of Italian literature often quotes his works. His Poetical Dictionary and Memoirs, as well as other pieces are inserted in the Raccolta Ferrarese di Opuscoli.
- Ireneo Affò (1781), Memorie di Taddeo Ugoleto Parmigiano, Bibliotecario di Mattia Corvino, rè di Ungheria, Parma: Stamperia reale (Biography of the librarian of Matthias Corvinus, King of Hungary.)
- Ireneo Affò (1780), Vita di Luigi Gonzaga, detto Rodomonte, Principe del Sacro Romano Impero, Parma: Presso Filippo Carmignani
- Ireneo Affò (1783), Vita di Monsignore Bernardino Baldi da Urbino, primo abate di Guastalla, Parma: Presso Filippo Carmignani (Biography of Bernardino Baldi, first abbott of Guastalla)
- Ireneo Affò (1779), Vita di Baldassare Molossi da Casalmaggiore detto Tranquillo, eccelento poeta latino, Parma: Presso Filippo Carmignani
- Ireneo Affò (1821), Vita di Pier Luigi Farnese, primo duca di Parma, Piacenta e Guastalla, Milan: Presso Paolo Emilio Giusti Stampatore, Librajo, e Fonditore nella contrada di Santa margherita No. 1118 e 1120 (Biography of Pier Luigi Farnese, Duke of Parma.)
- Ireneo Affò (1780), Vita del Cavaliere Bernardino Marliani, Mantovano, Parma: Presso Filippo Carmignani (Cavaliere Bernardino Marliani)
- Ireneo Affò (1774), Antichita e Pregi della Chiese Guastallese. Ragionamento storico-critico, Parma: Stamperia Reale
- Ireneo Affò (Le Père) (1784), Vita del graziosissimo pittore Francesco Mazzola, detto il Parmigiano, Parma: Presso Filippo Carmignani (Biography of Francesco Mazzola, Parmigianino)
- Ireneo Affò (1784), Vita del beato Orlando de Medici, eremita : colla storia del culto già da quattro secoli prestatogli in Busseto ovvero riposa il venerabile suo corpo, Parma: Stamperia Reale (Live of the Blessed Orlando de Medici, and cult of his relics)
- Ireneo Affò (1780), Vita di Vespasiano Gonzaga, Duca di Sabbioneta and Trajetto, Marchese di Ostiano, Conte di Rodigo, Fondi, etc., Parma: Presso Filippo Carmignani (Biography of Vespasiano I Gonzaga)
- Ireneo Affò (1795), Storia della città di Parma, Tomo Quarto, Parma: Stamperia Carmignani (History of Parma)
- Costantino Poggi: Ireneo Affò, Rivista italiana di Numismatica, pp. 145-153, Milano, 1890
- "The General biographical dictionary: containing an historical and critical account of the lives and writings of the most eminent persons in every nation; particularly the British and Irish; from the earliest accounts to the present time. New ed., rev. and enl. by Alexander Chalmers".