Holders of the office are known from 1123 onwards, but its duties were occasionally performed by an official of lower status with the title of Keeper of the Great Seal. From the 15th century, the Chancellor was normally a Bishop or a Peer.
Cowan, Samuel, The Lord Chancellors of Scotland Edinburgh 1911. [1]
"Lord chancellors of Scotland in the Oxford DNB", in the Oxford Dictionary of National Biography, Oxford University Press, Sept 2004; online edn, Jan 2007 accessed 20 Feb 2007[permanent dead link]
1 Office is either vested in the Crown, or vacant. Status is currently debated. 2 There is debate around whether these offices constitute Officers of the Crown.