Looks like a recent article shows that this Spencer line is not related to the Despensers, and this Henry is the earliest known.
See
http://nielsenhayden.com/genealogy-tng/getperson.php?personID=I2160...
Earliest known member of this line. The pedigree in the 1619 Visitation of Warwickshire linking this Spencer family with the Despencers has been disproved.
Sources
[S4464] Clifford L. Stott, "Ancestry of Agnes Spencer, Wife of Thomas Higginson of Berkeswell, Warwickshire, Ancestor of Nine American Immigrants, Cousin to Diana, Princess of Wales, Sir Winston Churchill, President George Washington, and Others." The New England Historical and Genealogical Register 174:199, Summer 2020; 174:330, Fall 2020