The elevation of Christ into heaven by His own power in presence of His disciples the fortieth day after His Resurrection.  It is narrated in Mark 16:10, Luke 24:51, and in the first chapter of the Acts of the Apostles.

Although the place of the Ascension is not distinctly stated, it would appear from the Acts that it was Mount Olivet.  Since after the Ascension the disciples are described as returning to Jerusalem from the mount that is called Olivet, which is near Jerusalem, within a Sabbath day’s journey.  Tradition has consecrated this site as the Mount of Ascension and Christian piety has memorialized the event by erecting over the site a basilica.  St. Helena built the first memorial, which was destroyed by the Persians in 614, rebuilt in the eighth century, to be destroyed again, but rebuilt a second time by the crusaders.  This the Moslems also destroyed, leaving only the octagonal structure which encloses the stone said to bear the imprint of the feet of Christ, that is now used as an oratory.