Lancey, William Heathcote De was born on October 8, 1797 in Mamaroneck, New York, United States. Son of John Peter and Elizabeth (Floyd) De Lancey.
Graduated from Yale, 1817, honorary Doctor of Divinity, 1827. Studied theology under Bishop Hobart, New York City 1817-1822. Doctor of Civil Law (honorary), Oxford (England) University, 1852.
Ordained priest Protestant Episcopal Church, 1822. Assistant minister and secretary Philadelphia diocese, 1822-1828. Secretary House of Bishops of General Convention, Protestant Episcopal Church, 1823, 26.
Provost University of Pennsylvania, 1828-1833. 1st bishop Diocese of Western New York, 1839-1865. Represented American Church at London during 3d Jubilee of Society for Propagation of Gospel, 1852.
Co-founder DeVeaux College, Niagara Falls, New York.
Married Frances Munro, November 22, 1820, 8 children including Edward.