Richard King Mellon, commonly known as R.K., was an American financier, general, and philanthropist from Ligonier, Pennsylvania, and part of the Mellon family.

Ligonier is a borough in Westmoreland County, Pennsylvania, United States. The population was 1,513 at the 2020 census. Ligonier was settled in the 1760s. The borough is well known for nearby Idlewild Park, one of the oldest amusement parks in the country; and nearby Seven Springs Mountain Resort. Another tourist attraction is Fort Ligonier Days, a parade and craft market that takes place every fall over the course of three days, and the Ligonier Country Market in the summer months. Ligonier is part of the Pittsburgh Metropolitan Statistical Area.