The General Assembly of the Church of Scotland is the sovereign and highest court of the Church of Scotland, and is thus the Church's governing body. It generally meets each year and is chaired by a Moderator elected at the start of the Assembly. As a Presbyterian church, the Church of Scotland is governed by courts of elders rather than by bishops. At the bottom of the hierarchy of courts is the Kirk Session, the court of the parish; representatives of Kirk Sessions form the Presbytery, the local area court. Formerly there were also Synods at regional level, with authority over a group of presbyteries, but these have been abolished. At national level, the General Assembly stands at the top of this structure. General Assembly meetings are usually held in the Assembly Hall on the Mound, Edinburgh. This was originally built for the Free Church in the 19th century. Before this, from 1845 to 1929, the General Assembly had met in the Victoria Hall (the Highland Tolbooth Kirk) at the top of the Royal Mile, a purpose-built meeting hall and church whose spire towers above the present Assembly Hall. When the Church of Scotland merged with the United Free Church of Scotland in 1929, the Mound premises were chosen as the Assembly Hall for the reunited Church of Scotland. Today the former Victoria Hall building is in secular use as The Hub. Earlier General Assemblies had taken place in different churches in Scotland's major burghs. The Church of Scotland General Assembly usually meets for a week of intensive deliberation once a year in May. Ministers, elders and deacons are eligible to be "Commissioners" to the General Assembly. Typically a parish minister would attend the Assembly once every four years, accompanied by an elder from that congregation. The Assembly also has youth representatives and a few officials. Prior to each Assembly, a minister or elder is nominated to serve as Moderator for that year. At the start of the Assembly the Moderator is duly elected, although the election is considered a formality.