 On May 21, 1752, shortly after Martin had come of age on his twenty-first birthday, Lord Fairfax granted Greenway Court to his nephew, along with of limestone lands on the west bank of the Shenandoah River across from Leeds Manor, which were "to be known and called by the name of the Manor of Greenway Court" and subject to an annual quit-rent fee of "a good buck and doe" due on the feast day of Saint Michael the Archangel.Greenway Court had taken its name from the Culpeper family's manor in Kent.Desiring a larger role for himself in the proprietary's administration, Martin sought to influence his uncle into reorganizing the management of the proprietary.