John de Leoncello OSB (Latin : Joannes de Leoncello; Croatian : Ivan de Leoncello) was a prelate of the Catholic Church who served as the bishop of Duvno from 1345 to 1355.
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Born in present-day France, John joined the Cistercian abbey in Léoncel near Rhone in present-day France, which belongs to the Diocese of Valence, as a young man. [1] In 1320, he was uncanonically consecrated as a bishop by the excommunicated Archbishop Andrew of Bar, who appointed him the bishop of Chunavia in present-day Albania. However, the diocese was subordinated to the Archdiocese of Durrës. [2] [3] As a result, John was suspended on 10 July 1325 by Pope John XXII, who ordered him to return to his abbey in Léoncel without any episcopal honours. John complied with the Pope's order, and after spending several years in the Léoncel abbey, he left the Cistercians and joined the Benedictine Abbey of Île Barbe, with the consent of his superior and subsequent approval from the Pope. [2]
Following Madius' resignation, Pope Clement VI lifted John's suspension and appointed him as his successor as the bishop of Duvno on 20 July 1345. [2] On 22 December 1345, he was exempted from paying a nomination fee due to poverty. Both of the documents were discovered by Dominik Mandić. As other documents are lacking, it remains unclear whether John took over the diocese or was merely a titular bishop. The document regarding his exemption from paying the fee highlights the poor conditions of the Diocese of Duvno after its patrons from the Šubić family lost political influence. [3]