The title Baron Lucas, of Crudwell in the County of Wiltshire, was created at the request of John Lucas, her father, in 1663 for Mary, Countess of Kent, new wife of the 11th Earl of Kent and only surviving child of the 1st Baron of the first creation above. The title was created with remainder to her heirs male by Lord Kent and failing which to her heirs general without division (the latter being the same way that the Crown passed, i.e. to the eldest daughter in the absence of sons, rather than going into abeyance or to the nearest male-line relative). The 1st Baroness was succeeded by her son, who had already succeeded as 12th Earl of Kent, and who was successively created Marquess of Kent and Duke of Kent. (See Duke of Kent for information on the Kent peerages.)