Walter fitz Alan

Around 1136 Walter fitz Alan, an Anglo-Norman baron, entered the service of David I, King of Scotland.  King David awarded Walter the newly created title of High Steward of Scotland around 1150.  The role that gave him oversight of the domestic, especially financial affairs, of the royal household and the title passed to his descendants. 

Walter’s family adopted the name of Steward, which evolved into Stewart, then Stuart. 

The Office of High Steward later merged with the Crown and the House of Stewart/Stuart became Royal House of Scotland.