The Leghs of Lyme were a gentry family seated at Lyme Park in Cheshire, England, from 1398 until 1946, when the stately home and its surrounding parkland were donated by the 3rd Lord Newton to The National Trust. For ease of distinguishing between the earlier generations, it became customary to append a Roman numeral to the various Leghs' names; in this case the numbering system is as used in The National Trust Handbook for Lyme Park.