William Lowry Waring was mentioned in the 13 October 1798 will of his father, Robert Payne Waring, proved on 17 June 1799. [Essex County, Virginia, Will Book 15, pages 457–461.]

On 22 January 1814, a division of the slaves belonging to the estate of Richard Banks, deceased, was made by Jno. Smith, Newman Brockenbrough, and W. Blake, to Elizabeth Banks, Polly Banks (also listed as Mary Banks), and Samuel Muse (who married Elizabeth Banks). On 29 January 1819, this was further acknowledged by Eliza S Banks and Wm L Waring. [Essex County, Virginia, Will Book 19, pages 31–32.]

The estate of Richard Banks, deceased, in account with Samuel Muse from 1810 to 1819 was settled on 29 January 1819, with equal distributions to Saml. Muse, Eliza S. Banks, and Wm. L. Waring. [Essex County, Virginia, Will Book 19, pages 28–30.]

William L. Waring was mentioned, as a co-executor, in the 22 November 1821 will of his mother-in-law, Elizabeth Smith Banks, proved 16 December 1822. [Essex County, Virginia, Will Book 19, pages 351–352.]

On 26 December 1822, Samuel Muse and William L. Waring agreed that Joseph Janey, William Smith and Kemp Gatewood were to value and divide the remaining property of Richard Banks, deceased, as they were the only two devisees in right of their wives, Mary Waring and Elizabeth Y. Muse. The division was returned to court on 18 August 1823. [Essex County, Virginia, Will Book 19, pages 390–391.]

On 2 December 1834, William L. Waring witnessed the will of Alexander Dunn, and proved the will in court on 16 March 1835. [Essex County, Virginia, Will Book 23, page 325.]

On 25 March 1835, an inventory and appraisal of the estate of Alexander Dunn, deceased, was made by Wm. L. Waring, John Boughton and Brooks Boughton. (At the top, the name Boughton is twice written Booton.) [Essex County, Virginia, Will Book 23, page 362.]

On 1 December 1836, an inventory and appraisal of the estate of Robert Wright was made by Thomas N. Clarke, Richard L. Covington, and George Hill. Includes Easter a Negro Woman. On 15 July 1837, an inventory and appraisal of the property lent Robert Wright by William L. Waring was listed, including Peggy a negro woman, Eliza a Girl, Henry a boy and Nancy a small Girl. [Essex County, Virginia, Will Book 24, pages 152–153.]