The Indo-Iranian religion, that is the cult of Mithra, spreads in the Roman Empire, which sets the celebration of the winter solstice on December 25th, considered the birth of Mithra-Sun, which later became the Christmas of Christ for Christians.
The Indo-Iranian religion, that is the cult of Mithra, spreads in the Roman Empire, which sets the celebration of the winter solstice on December 25th, considered the birth of Mithra-Sun, which later became the Christmas of Christ for Christians.