Question: The medieval fortification Castle Hill was builty by this noble man who was also known as King of which country (after the 1250s)?
Sentence (from "Richard, 1st Earl of Cornwall"): Richard (5 January 1209 – 2 April 1272), second son of John, King of England, was the nominal Count of Poitou (1225-1243), Earl of Cornwall (from 1225) and King of Germany (from 1257).
Relevant evidence: Yes