Question: Whose son's death brought titles to Edward III's most trusted captain?
Sentence (from "Henry of Grosmont, 1st Duke of Lancaster"): Henry of Grosmont, 1st Duke of Lancaster, 4th Earl of Leicester and Lancaster, KG (c. 1310 – 23 March 1361), also Earl of Derby, was a member of the English nobility in the 14th century, and a prominent English diplomat, politician, and soldier.
Relevant evidence: No