The Peerage of Scotland is the division of the BritishPeerage for those peers created in the Kingdom of Scotland before 1707. With that year's Act of Union, the Kingdom of Scotland and the Kingdom of England were combined into the Kingdom of Great Britain, and a new Peerage of Great Britain was introduced in which subsequent titles were granted. 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. 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 extant Scottish peers, all higher or equal titles in the other peerages are listed. If a Scottish peer holds a lower title in the Peerages of England, Great Britain, or the United Kingdom, and therefore sat (or, in the cases of Life peerages, sits) by virtue of such a peerage in the House of Lords, such a lower title is listed. A holder of multiple Scottish peerages is listed only under the highest one.