[1] His paternal grandfather was Nicholas Bayard (c. 1644–1707), the 16th Mayor of New York City and a nephew of Peter Stuyvesant.
[7][8] During his first year in office, he took steps to found a college in New York City, feeling that New Yorkers had neglected the interests of education.
[8] Bayard had country estate and farm at Castle Point, called Hoboken, in Bergen County, New Jersey.
William, who originally supported the revolutionary cause, became a Loyalist Tory after the fall of New York in 1776 when the city and surrounding areas, including the west bank of the renamed Hudson River, were occupied by the British.
In 1784, the land described as "William Bayard's farm at Hoebuck" was bought at auction by Colonel John Stevens for £18,360 (then $90,000).