Question: What is the date of death of Harriet Leveson-Gower, Countess Granville's mother?
Sentence (from "Sir William Leveson-Gower, 4th Baronet"): He added the surname Leveson to his own in 1668, when he inherited the Trentham and Lilleshall estates of his maternal great- uncle, Sir Richard Leveson.
Relevant evidence: No