In 1747, Frederick Rohrer, a Mennonite from Germany, arrived in Philadelphia with his two oldest sons Samuel and Martin and the rest of his family. Frededick purchased property just east of Hagerstown from his brother Jacob, who had emigrated some years earlier. Their property was where Trovinger's Mill is now located. In 1763, Frederick's son Samuel bought three large tracts of land just north of Rohrersville at the same time John Rohrer of Lampeter, PA (perhaps a cousin?) bought the adjacent property, known as Piney Hills or Pennyhill. These properties are roughly bounded by Rohrersville Road (Rt. 67), Marble Quarry Road, Millbrook Road and Elk Ridge.