Prince William formally welcomed as Lord High Commissioner to GA of Church of Scotland Entertainment Prince William formally welcomed as Lord High Commissioner to GA of Church of Scotland Prince William on Friday was formally welcomed as Lord High Commissioner to the General Assembly of the Church of Scotland. He also inspected a guard of honour. Each year, The Queen appoints the Lord High Commissioner. Monarchs have sworn to maintain the Church of Scotland since the 16th century. The Queen made this pledge at the first Privy Council meeting of her reign. The Lord High Commissioner's role is to maintain the relationship between the State and the Church of Scotland.