One of the mares based at the Sedbury, Yorkshire stud of James Darcy, the elder, who was contracted to provide racehorses to King Charles II; she was described in the 1891 GSB as Kitt [Christopher's] Darcy's Royal Mare

Dam of Miss Darcy's Pet Mare, through which the maternal line of the family continues, and the dam of 1) Clumsey (sire of Fox, top class racehorse and Champion Sire in Great Britain in 1731 and 1735); 2) Grey Wilkes (a successful and significant broodmare, particularly as dam of Sister to Old Country Wench, dam of Squirt, grandsire of Eclipse); 3) Old Wen Mare (dam of Alcock's Arabian, Champion Sire in Great Britain in 1728)

Mitochondrial DNA has shown that Family 11 shares the same maternal line as Families 4 and 13. As there is no identifiable link between the families in historical records, the Sedbury Royal Mares which are the Foundation Mares of Families 11 and 13, and the Layton Barb Mare, Foundation Mare of Family 4, must all share a common maternal ancestor which predates the historical records.