Pierre van Cortlandt, the youngest son of Philij) the third son of Stephanus, born the 10th of January 1721, and who died the 1st of May, 1814, in consequence of the deaths in early numhood of his brothers Abraham, Philip, and John, unmarried, and of the death in 1756, of his eldest brother Stephen, and the absence in the army of his nephew Philip, Stephen's eldest son, became early and closely identified with the affairs of the manor and the interests of his relatives therein. Marrying Joanna a daughter of Gilbert Livingston he naturally leaned to political side of his wife's family in the party contests anterior to the opening of the American Revolution. He was the representative of the Manor in the Colony Assembly from 1768 to 1775, and unlike his ne|ihe\v, Philip, the head of the family, he took the American side in the Revolution. He was a member of the Provincial Convention, the Council of Safety, and the Provincial Congress ; and upon the organization ot the State Government in 1777, was chosen Lieutenant Governor of New York, and served as such till 1795. In 1787 he was President of the Convention which formed the Constitution of the United States. He had four sons Philip, Gilbert, Stephen, and Pierre, and four daughters, Catharine the wife ot Theodosius P. van Wyck, Cornelia, wife of Gerard G. Beekman, Anne wife of Philip S. van Rensselaer, so long the Mayor of Albany, at which city she died in 1855 at the age of 89 years, and Gertrude who died, a child in her eleventh year in December 1766. Of the four sons, two, Gilbert, and Ste{)lien, died in early life unmarried. The eldest was the celebrated Colonel Philip van Cortlandt of the Revolution, who at its close was made a Brigadier General, and died a bachelor Nov. 21st 1831.