After the Union, the old Scottish Peers elected 16 representative peers to sit in the House of Lords. The Peerage Act 1963 allowed all Scottish Peers to sit in the House of Lords, a right which was lost along with all other hereditary peers after the passage of the House of Lords Act 1999. Unlike most other peerage titles, many Scottish titles can pass through female lines, and in the case of daughters only, these pass to the eldest daughter rather than go into abeyance.[citation needed]
The ranks of the Scottish Peerage are Duke, Marquess, Earl, Viscount, and Lord of Parliament. Scottish Viscounts are unique from the other Peerages in using "of" in their title, as in Viscount of Oxfuird. Though this is the theoretical form, most Viscounts drop the "of". The Viscount of Arbuthnott and to a lesser extent the Viscount of Oxfuird, still actively use "of". Scottish Peers had the right to sit in the Parliament of Scotland. Scottish Barons rank below Lords of Parliament, and, while noble, are not conventionally considered peerage titles.
In the following table of the Peerage of Scotland as it currently stands, each peer's highest titles in each of the other Peerages (if any) are also listed.