In the county community, John Moss also was one of the group of gentlemen freeholders in whom the responsibility of power was reposed. He enjoyed the friendship and trust of Bryan Fairfax to the extent that he witnessed and served as coexecutor of the latter's will,[5] and he was a party to several land sales and leases which involved Fairfax.[6] By these transactions, he acquired extensive lands in Loudoun County as well as land on Dogue Creek in Fairfax County.[7] In colonial times, he served the Crown as Commissioner of the King's Revenue in Fairfax County and also as a justice of the County Court.[8] In the War for Independence, he served as a captain and afterward took an active part in organizing the new government--in particular, serving on a commission to supervise the Presidential election of 1788. Under the new State Government, he continued to serve as the Commissioner of Revenue for the county and a justice of the County Court. In 1796, in a law suit in Prince William County, John Moss, then 72, was able to state that he was the oldest justice of the court in commission at that time.[9] Service as a justice presumably involved John Moss in a wide range of decisions affecting the life of the county. The business of the County Court in this period was both judicial and administrative. Minor crimes were disposed of monthly, while major crimes and civil cases were handled in quarterly sessions.[10] At these sessions, the justices also acted on appointments, licenses for mills and ordinaries, road construction and repair, and the levying of taxes. Most of the justices were not trained in the law, and law books were scarce; therefore, the quality of justice and the transaction of public business were frequently leavened by reliance on common sense and experience.[11] If gentlemen freeholders held the power of government in colonial and post-Revolutionary Virginia, they also paid much of the cost of government. In 1786, John Moss and James Wren, Gentlemen, were appointed Commissioners of the Land Tax, the large counties in Virginia being allowed to have two such officials.[12] They were responsible for maintaining the tax book, personally calling on every person subject to taxation, and making four lists of taxable property in the county. (One was for the Clerk of the County Court, one for the sheriff, one for the Solicitor General, and one for the commissioner.) Annually, they submitted a list of changes in land ownership, by sale or inheritance.[13] For his service as a justice and as Commissioner of the Land Tax, John Moss's compensation came in the form of fees; he received no salary but under certain circumstances he was reimbursed for out-of-pocket expenses connected with his duties.[14]