There are two spellings for the name: Pierrepont or Pierpont.
Anna Constable married Hezekiah Pierrepont in 1802.

(1783 birth record) Anna Constable's Baptism is recorded in the Parish Register of Christ Church in Philadelphia, Pennsylvania. Book Year: 1769-1794; Page # 1118
Mary Ann Constable-daughter; Father-Wm [Constable].; Mother-Ann [White]
Baptism 1st of February 1784 by Rev. William White.
Born: 10th of March 1783.

(1782 marriage record) Her parents were married in Christ Church of Philadelphia.
Book Year 1709-1800; Page Number 4437
William Constable [1751-1803] and Ann White[1762-1826] were married by Rev. William White on the 28th of February 1782.

Anna White b. 1762 was the last child of Townsend/Townshend White and Ann Renaudet [1718-1777] with their marriage recorded in Christ Church on the 13th of July 1741. Townsend White's pew in Christ Church was #61.
There is a searchable database for Christ Episcopal Church of Philadelphia, Pennsylvania for names in their Parish Registers.

Anna Constable was married Jan. 21, 1802 in New York City to Hezekiah Beers Pierrepont by Bishop…
Hezekiah and Anna lived in Brooklyn Heights.

Book:
THE CONSTABLES
First Family of The Adirondacks
By Edith Pilcher; Published by North Country Books of Utica New York; 1992

Children:
[1.] William Constable Pierrepont b. 3 Oct. 1803 m. Cornelia Ann Butler.
[2.] Anna Constable Pierrepont b. 17 March 1805 m. Gerrit Gansevoort Van Wagenen.
[3.] Caroline Theresa Pierrepont b. 28 Feb. 1807 d. 17 Aug. 1823.
[4.] Henry Evelyn Pierrepont b. 8 Aug. 1808 m. Anna Maria Jay.
[5.] Emily Constable Pierrepont b. 10 Feb. 1810 m. Joseph Alfred Perry.
[6.] Francis Matilda Pierrepont b. 6 July 1812 m. Rev. Frederick S. Wiley.
[7.] Robert Fulton Pierrepont b. 7 March 1814 d. 27 Oct. 1814.
[8.] Harriet Constable Pierrepont b. 17 July 1818 m. Edgar John Bartow.
[9.] Mary Montague Pierrepont b. 18 June 1821 d. 17 Feb. 1853.
[10.] Maria Theresa Pierrepont b. 7 June 1823 m. Joseph Inglis Bicknell
[11.] Julia Evelyn Pierrepont b. 14 March 1825 m. John Constable.
[12.] Ellen Josephine Pierrepont b. 2 May 1828 m. James Monroe Minor.