I've been unable to find any ancestry information for the Priscilla Metcalf who married Van Swearingen, son of Lydia Ryley and Thomas Swearingen. I'm thinking she might be related to the Joseph Midcaf (aka Metcalf) who sold property near Hagerstown to James Perry in 1744:
21 Nov 1744. Joseph MIDCAF of Prince Georges County, Maryland, planter, to James PERRY of PG Co., planter, for 60 L, a tract of land called MIDCAFS Meadow, lying in PG, bounded by a little spring within a ½ mile of the Waggon Road that goes from Stulls Mill to the mountains, containing 100 acres of Calerton or Conegoehege Manor (royal mines excepted). Signed: Joseph (his mark) MIDCALF. Wit: Edward OWON (Owen), James (+ his mark) LIN, Nath. WICKHAM, Joseph CHAPLINE. This deed was ack. By Jos MIDCAF and Mary, his wife. Recorded Nov. 28, 1744. (Prince George’s County, Maryland, Land Records 1743-1746, TLC Genealogy, 1998, p. 61.)
The JOSEPH CHAPLINE who witnessed the deed may be the Joseph Chapline who was the son of Lydia Ryley Swearingen's sister, Elizabeth, who married William Chapline. Looking for other pieces of info re Priscilla Metcalf Swearingen that might connect her to this Joseph Metcalf.