John Denn, Lessee of Charles C. Scott and Others v. Thomas Reid, Jun., and Others was a case heard by the United States Supreme Court in 1836. The dispute involved two conflicting land titles to a tract of land located in Pennsylvania that were both derived from an original grant issued by William Penn to John Simcock in 1702. The plaintiff argued that they had acquired title through their lessee's purchase from one of Simcock's heirs while the defendant claimed title through another heir who had conveyed it to them before the plaintiff’s acquisition occurred. In its decision, the court held that although there may have been some irregularities with respect to how each party obtained their respective titles, these did not invalidate either claim as long as neither party knew or should have known about any such defects when they made their purchases; thus affirming both parties' rights over the disputed property based on priority of possession rather than legal validity alone.

In the case of John Denn, Lessee of Charles C. Scott, and Others v. Thomas Reid, Jun., and Others, the Supreme Court was asked to decide whether a tenant in common had exclusive rights to use an access road that crossed over another tenant’s land without their permission or consent. The majority opinion held that tenants in common do not have exclusive rights to use roads across other tenants' lands without their permission or consent; however Justice McLean dissented from this opinion arguing that such a right should exist as it is necessary for the enjoyment of property by all parties involved. He argued that if one party has exclusive control over an access road then they can prevent others from using it which would be detrimental to both parties since each needs access for full enjoyment of their respective properties. Furthermore he argued against allowing one party complete control because it could lead them down a path towards claiming ownership over parts of someone else's land which would be unjustified under law and precedent set forth by earlier cases on similar matters