When did John Henry Newman convert to Roman Catholicism?

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St. John Henry Newman English prelate, theologian, and poet John Henry Newman converted to Roman Catholicism in 1845. He was made a cardinal in 1879.

John Henry Newman was received into the Roman Catholic Church on October 9, 1845, at Littlemore.12

Prior to his conversion, Newman had been a prominent leader of the Oxford movement, which sought to renew Catholic thought and practice within the Church of England. His decision to convert followed a period of intense meditation on the concept of doctrinal development, during which he concluded that the early, undivided church had developed into the modern Roman Catholic Church. Shortly after his reception into the church, he published his influential work, the Essay on the Development of Christian Doctrine.21