Prior to 1923, Abdulaziz had not risked invading the Hejaz because Hussein bin Ali, King of the Hejaz, was supported by Britain. However, in that year, the British withdrew their support. At a conference in Riyadh in July 1924 complaints were stated against the Hejaz; principally that pilgrimage from Najd was prevented and it boycotted the implementation of certain public policy in contravention of "shari'a". Ikhwan units were massed on a large scale for the first time, and under Khalid bin Lu'ayy and Sultan bin Bajad rapidly advanced on Mecca laying waste to symbols of "heathen" practices. The Ikhwan completed their conquest of the Hejaz by the end of 1925. On 10 January 1926 Abdulaziz declared himself King of the Hejaz and, then, on 27 January 1927 he took the title King of Najd (his previous title was Sultan). The use of the Ikhwan to effect the conquest had important consequences for the Hejaz: The old cosmopolitan society was uprooted, and version of Wahhabi culture was imposed as a new compulsory social order.