The festival of the Nativity which later turned into Christmas was a 4th-century feast in the Western Church notably in Rome and North Africa, although it is uncertain exactly where and when it was first celebrated.[117] There has been debate about the reason why Christians came to choose the 25 December date to celebrate the birth of Jesus. One theory is that they did so in order to oppose the existing winter-solstice feast of the Natalis Solis Invicti (Birthday of the Unconquered Sun) by celebrating on that date the birth of the “Sun of Righteousness”.[118]

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