I want to know the answer to the following question:
Who was the father of John Manners, Marquess of Granby?
All the background I'm provided with is that "These pubs were named after John Manners, Marquess of Granby, who was the son of John Manners, 3rd Duke of Rutland and a general in the 18th century British Army.". Is that enough to answer the question?