Susan (22) LeRoy, the third child born to Elizabeth (4) Emmet and William H LeRoy, may have been born in New York City, but was probably born in Potsdam, NY, where her parents were living at the time. Because William's father, Herman LeRoy, was the Consul General representing Holland, he served as the American agent for a group of Dutch businessmen who wanted to invest in an enormous tract of land comprising most of western New York State. The finances of the owner, Robert Morris, had declined precipitously and he needed to unload the almost two miilion acres he had bought from Massachusetts, a state whose boundaires stretched way beyond its present borders at that time.
Since the law prohibited sales of American land to foreigners, the so-called "Holland tract" was deeded to LeRoy and others as trustees in 1792. Three weeks later, on January 11, 1793, an adjacent tract was sold directly by Morris, to Herman LeRoy, his business partners William Bayard and James McEvers and to Herman's brother-in-law Matthew Clarkson, a hero of the Revolution.
Known as the "Triangle Tract," the funds for the purchase came from Samuel Cornell, a Tory whose property in New Bern, North Carolina had been confiscated, but he was able to return to New York and rebuild his fortune, which went to his three daughters when he died in 1781. The husbands of the three daughters, Herman LeRoy, William Bayard and Matthew Clarkson used this inheritance to buy the Triangle Tract as an investment. Bayard's son Robert and two of Herman's sons, Jacob and William Henry LeRoy moved up to St. Lawrence County and lived there for a period of time to oversee the property.
Susan returned to the New York City with her family as a child but died there when she was 22 years old.. She was buried in vault #148 in the NY Marble Cemetery on 2nd Street which had only recently been purchased by her uncle, Thomas (6) Addis Emmet.