In the 2nd millennium, the Greys were elevated as viscounts, earls, marquesses, dukes and monarchs. This non-peerage title is accorded to younger sons of dukes and marquesses. The club's original members included five dukes, five marquesses, twenty earls and two cabinet ministers. He is the ancestor of the earls, marquesses and dukes of Abercorn. The honorific prefix of "Lady" is used for the daughters of dukes, marquesses, and earls. He was the founder of the long line of the marquesses and dukes of Hamilton. The highest government officials could be enfeoffed as marquesses. The Castle was the traditional home of the Earls (later Marquesses, now Dukes) of Atholl. The mansion served as the London residence of the Marquesses of Londonderry. Plas Machynlleth was the Welsh residence of the Marquesses of Londonderry. For examples of fictional marquesses and marchionesses, see List of fictional nobility#Marquesses and marchionesses. Longleat is an English stately home and the seat of the Marquesses of Bath. Marquesses of Ailsa, the most powerful family in Ayrshire. According to Hill, Alexander Stewart was the ancestor of the Stewart Marquesses of Londonderry. Wang's new seals demoted them to the titles of marquesses.