A deathbed conversion is the adoption of a particular religious faith shortly before dying. Making a conversion on one's deathbed may reflect an immediate change of belief, a desire to formalize longer-term beliefs, or a desire to complete a process of conversion already underway. Claims of the deathbed conversion of famous or influential figures have also been used in history as rhetorical devices.
Conversions at the point of death have a long history. The first recorded deathbed conversion appears in the Gospel of Luke where the good thief, crucified beside Jesus, expresses belief in Christ. Jesus accepts his conversion, saying "Today you shall be with Me in Paradise".
Perhaps the most momentous conversion in Western history was that of Constantine I, Roman Emperor and later proclaimed a Christian Saint by the Eastern Orthodox Church. While his belief in Christianity occurred long before his death, it was only on his deathbed that he was baptised, in 337. While traditional sources disagree as to why this happened so late, modern historiography concludes that Constantine chose religious tolerance as an instrument to bolster his reign.
Charles II of England reigned in a Anglican nation at a time of strong religious conflict. Though his sympathies were at least somewhat with the Roman Catholic faith, he ruled as an Anglican, though he attempted to lessen the persecution and legal penalties affecting non-Anglicans in England, notably through the Royal Declaration of Indulgence. As he lay dying following a stroke, released of the political need, he was received into the Catholic Church.
The most famous French fabulist published a revised edition of his greatest work, Contes, in 1692, the same year that he began to suffer a severe illness. Under such circumstances, Jean de La Fontaine turned to religion. A young priest, M. Poucet, tried to persuade him about the impropriety of the Contes, and it is said that the destruction of a new play of some merit was demanded and submitted to as a proof of repentance. La Fontaine received the Viaticum, and the following years, he continued to write poems and fables. He died in 1695.
Sir Allan Napier MacNab, Canadian political leader, died 8 August 1862 in Hamilton, Ontario. His deathbed conversion to Catholicism caused a furor in the press in the following days. The Toronto Globe and the Hamilton Spectator expressed strong doubts about the conversion, and the Anglican rector of Christ Church in Hamilton declared that MacNab died a Protestant. MacNab's Catholic baptism is recorded at St. Mary's Cathedral in Hamilton, performed by John, Bishop of Hamilton, on 7 August 1862. Lending credibility to this conversion, MacNab's second wife, who predeceased him, was Catholic, and their two daughters were raised as Catholics.
Author and wit Oscar Wilde converted to Catholicism during his final illness.Robert Ross gave a clear and unambiguous account: 'When I went for the priest to come to his death-bed he was quite conscious and raised his hand in response to questions and satisfied the priest, Father Cuthbert Dunne of the Passionists. It was the morning before he died and for about three hours he understood what was going on (and knew I had come from the South in response to a telegram) that he was given the last sacrament. The Passionist house in Avenue Hoche, has a house journal which contains a record, written by Dunne, of his having received Wilde into full communion with the Church. While Wilde's conversion may have come as a surprise, he had long maintained an interest in the Catholic Church, having met with Pope Pius IX in 1877 and describing the Roman Catholic Church as "for saints and sinners alone - for respectable people, the Anglican Church will do". However, how much of a believer in all the tenets of Catholicism Wilde ever was is arguable: in particular, against Ross's insistence on the truth of Catholicism: "No, Robbie, it isn't true." "My position is curious," Wilde epigrammatised, "I am not a Catholic: I am simply a violent Papist."
In his poem Ballad of Reading Gaol, Wilde wrote:
Ah! Happy they whose hearts can break
And peace of pardon win!
How else may man make straight his plan
And cleanse his soul from Sin?
How else but through a broken heart
May Lord Christ enter in?
The poet Wallace Stevens is said to have been baptized a Catholic during his last days suffering from stomach cancer. This account is disputed, particularly by Stevens's daughter, Holly, and critic, Helen Vendler, who, in a letter to James Wm. Chichetto, thought Fr. Arthur Hanley was "forgetful" since "he was interviewed twenty years after Stevens' death."
One famous example is Charles Darwin's deathbed conversion in which it was claimed by Lady Hope that Darwin said: "How I wish I had not expressed my theory of evolution as I have done." He went on to say that he would like her to gather a congregation since he "would like to speak to them of Christ Jesus and His salvation, being in a state where he was eagerly savoring the heavenly anticipation of bliss." Lady Hope's story was printed in the Boston Watchman Examiner. The story spread, and the claims were republished as late as October 1955 in the Reformation Review and in the Monthly Record of the Free Church of Scotland in February 1957.
Lady Hope's story is not supported by Darwin's children. Darwin's son Francis Darwin accused her of lying, saying that "Lady Hope's account of my father's views on religion is quite untrue. I have publicly accused her of falsehood, but have not seen any reply."  Darwin's daughter Henrietta Litchfield also called the story a fabrication, saying "I was present at his deathbed. Lady Hope was not present during his last illness, or any illness. I believe he never even saw her, but in any case she had no influence over him in any department of thought or belief. He never recanted any of his scientific views, either then or earlier. We think the story of his conversion was fabricated in the U.S.A. The whole story has no foundation whatever."