Was he a Baron, or was that his first name? Found no Baron Peacock at familysearch.org .
A William B. Peacock was born in 1785 in Gainsborough, Lincolnshire, England.
A William B. Peacock was born 22 Feb 1780 near New York City and died 21 Feb 1877 at Mayville, Chautauqua, NY.
Thomas Peacock (1730 - 1828)
Margaret Anderson Peacock (1751 - 1816)
Spouse: Alice Evans Peacock (1780 - 1859)*
Sibling: Absalom Peacock (1787 - 1831)*
Burial: Peacock Cemetery, Mayville, Chautauqua County, New York, USA