When the Roman Empire became Christian under Constantine, Jews were allowed to enter Jerusalem once a year, on the ninth day of the Jewish month of Av, to lament the loss of the Temple and pray here at the Wall. Over the years, efforts were made by various Jewish groups to purchase the property, but Muslims also consider the site holy, saying it was at the Western Wall that the Prophet Mohammed rested his horse – and from a stone now inside the Mosque of Omar he ascended into heaven. Only after the Six-Day War of 1967 were Jews guaranteed daily access to the Wall.