Robert Carter I as the steward and land agent for the Northern Neck Proprietary, a position in which Fairfax served until his death in 1757. In 1750, Martin's uncle Lord Fairfax established himself at his hunting plantation Greenway Court estate near present-day White Post in Clarke County with the intention of administering the proprietary himself. Lord Fairfax had previously reserved this land as his private residence in 1747, then known as "the Quarter". With his cousin William Fairfax acting as land agent, Lord Fairfax sought additional assistance in managing the proprietary and scrutinized which of his family members from England would be up to the task. Lord Fairfax first considered his brother Robert, then his brother-in-law Denny Martin, and in 1751, he finally decided upon enlisting the assistance of his twenty-year-old nephew and Denny Martin's son, Thomas Bryan Martin. Lord Fairfax sent for Martin, who arrived in Virginia from England aboard the Hatley on May 24, 1751, accompanied by William Fairfax, who had been seeking an appointment to a position in England. Martin and Fairfax arrived in Williamsburg, where they dined with Fairfax's fellow Virginia Governor's Council member John Blair, Sr., and visited the Governor's Palace and the Capitol before beginning their journey toward the Northern Neck on May 31. Following his arrival at the Northern Neck Proprietary, Martin settled at Greenway Court with his uncle that autumn. Due to his humble upbringing, Martin quickly adapted to frontier life at Greenway Court. He soon earned the affections of Lord Fairfax on account of his energetic nature, his loyalty, and his good eyesight, which greatly assisted his myopic uncle. 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. At Martin's suggestion, Lord Fairfax relocated the proprietary's base of operations northwest from Belvoir to an expressly