Conversation so far:
Why did Richard III of England have to be reburied?
CANNOTANSWER.
What was his tomb like?
His cathedral tomb was designed by the architects van Heyningen and Haward.
Was he buried with anyone?
CANNOTANSWER.
Did his burial attract a lot of people?
His remains were carried in procession to the cathedral on 22 March 2015.

Question: Who was in the procession?
Self-contained rewrite: Who was in the procession for the burial of Richard III of England?