1870 Census, Linganore PO, Liberty Dist 8, Fred. Co. #460
all cannot read or write
Richard Valentine 52, works on farm, $500 house, MD
Henerette Valentine 43

tombstone in Keys Chapel Cemetery:
Richard Valentine 11/30/1867 - 5/17/1892 Aged 24 yr 5 mo 17 da (birth date calc'd)
[This most likely is that of a son of Richard and Henrietta Valentine? - RHS]

two more Valentines (on one tombstone - no birth date for either)
William E Valentine 7/30/1887
E. Virginia Valentine 12/16/1888