On this day, February 29, conversations the world over may conjure the name of Pope Gregory XIII – widely known for his reform of the calendar that bears his name.The need for calendar reform was driven by the inaccuracy of the Julian calendar. Introduced in 46 BC, the Julian calendar fell short of the solar year – the time it takes Earth to orbit the Sun – by about 12 minutes each year.To correct this, Gregory convened a commission of experts who fine-tuned the leap-year system, giving us the one we have today.But the Gregorian calendar isn’t the only legacy Pope Gregory left. His papacy encompassed a broad spectrum of achievements that have left a lasting mark on the world.Rise to papacyBorn in 1502 as Ugo Boncompagni, Gregory made many contributions to the life of the Catholic Church, the city of Rome, education, arts and diplomacy.Before ascending to the papacy, Boncompagni had a distinguished career in law in Bologna where he received his doctorate in both civil and canon law. He also taught jurisprudence, which is the theory and philosophy of law.His intellectual influence positioned him as a trusted figure in legal and diplomatic circles even before his election as pope in the 1572 conclave. Upon being elected he adopted the name Gregory, in honour of Pope Gregory the Great who lived in the sixth century.Movement in the ChurchOne of Gregory’s major undertakings was reforming the Catholic Church in response to the Reformation, a movement which established a distinct new branch of Christianity, Protestantism, separated from the Catholic Church.Gregory aimed to implement the decisions of the Council of Trent, which met between 1545 and 1563, and defined key Christian doctrines and practices, including scripture, original sin, justification, the sacraments and saint veneration. Its outcomes directed the church’s future for centuries.Gregory’s administrative reforms were aimed at centralising church governance and its operations. As pope, he relished the practice of law, personally engaging in judicial deliberations and surprising his contemporaries with his legal acumen.His papacy also marked a revision of Gratian’s Decretals, a collection of 12th-century church laws that served as a textbook for lawyers. Gregory aimed to correct numerous errors and unify the various versions of this foundational text of canon law. This culminated in the publication of an amended edition in 1582.
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