The Mount of Olives or Mount Olivet (Hebrew: הַר הַזֵּיתִים, Har HaZeitim; Arabic: جبل الزيتون, الطور‎, Jabal az-Zaytūn, Aț-Țūr) is a mountain ridge east of and adjacent to the Jerusalem's Old City. It is named for the olive groves that once covered its slopes. The southern part of the Mount was the Silwan necropolis, attributed to the ancient Judean kingdom. The Mount has been used as a Jewish cemetery for over 3,000 years, and holds approximately 150,000 graves, making it central in the tradition of Jewish cemeteries. Several key events in the life of Jesus as related in the Gospels took place on the Mount of Olives, and in the Book of Acts it is described as the place from which Jesus ascended to heaven. Because of its association with both Jesus and Mary, the Mount has been a site of Christian worship since ancient times and is today a major site of pilgrimage for the Eastern Orthodox, Catholics and Protestants.