Sims's Lessee v. Irvine, 3 U.S. (3 Dall.) 425 (1799), is an early United States Supreme Court case about conflicting land claims. General William Irvine had been granted Montour's Island by Pennsylvania for his service in the American Revolutionary War, but the island was also claimed by Charles Simms of Virginia. The Court unanimously found in favor of Simms, who had the earlier claim. The Court held that: "A military right to unappropriated land in America, acquired under a royal proclamation of 1763, was made assignable by the law of Virginia, to an inhabitant of that State.