He was appointed one of 18 Scottish representative peers in 1707.

Montgomerie was elected as one of sixteen Scottish representative peers, in 1776.

He was a Scottish Representative Peer from 1874 to 1906.

He was elected as a Scottish Representative Peer in 1790, remaining one until 1807.

Those chosen by Scotland sat for a single term, and following each dissolution new Scottish peers were elected.

However, it was suggested, the election of Scottish representative peers was not entrenched, and therefore could be amended.

Until 1999, Scottish peers were entitled to sit in the House of Lords.

He was a Scottish Representative Peer from 1747 to 1761 and from 1774 to 1790.

Between 1707 and 1963, Scottish peers participated in elections to determine which of them would take the sixteen seats allocated to them as a whole.

In 1945 he was elected a Scottish Representative Peer.