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Traquair house is considered to be the oldest continually inhabited house in Scotland. It is built in the style of a fortified mansion, and not stictly a castle. It predates the Scottish Baronial[?] style of architecture, and may have been one of the influences on this style.
Tradition dates the origins of the house to 950 when Alexander I stayed in hunting lodge on the site.
The house is open to the public and counts among its features:
wikipedia.org dumped 2003-03-17 with terodump