Conversation so far:
What awards and honours did Ringo Starr win?
Ringo Starr and the other members of the Beatles were appointed Members of the Order of the British Empire in the 1965 Birthday Honours.
Did Ringo Starr win any other awards and honours besides appointed Members of the Order of the British Empire?
In 1971, Ringo Starr and the Beatles received an Academy Award for Best Original Song Score for the film Let It Be.
Did Ringo Starr receive any honors?
On 8 February 2010, Ringo Starr was honoured with the 2,401st star on the Hollywood Walk of Fame by the Hollywood Chamber of Commerce.
Any other acknowledgements for Ringo Starr besides his star on the Hollywood Walk of Fame?
Ringo Starr was knighted in an investiture ceremony at Buckingham Palace by Prince William, Duke of Cambridge on 20 March 2018.

Question: What was he knighted for?
Self-contained rewrite: What was Ringo Starr knighted for?