Short answers, pulled from the story.
Geoffrey Chaucer died in 1400 and was buried within the South Transept of Westminster Abbey. His interment there owed more to his job as Clerk of Works for the Palace of Westminster than to his literary fame.
Nicholas Brigham erected a grey Purbeck marble memorial over Geoffrey Chaucers grave site in 1556. This monument transferred Chaucers remains to a new location where they remain today.
Elizabeth Gaskell received the latest addition when her panel was unveiled on the 25th of September 2010. The stained glass window installed in 1994 holds room for twenty names but currently displays only six entries.
Thomas Hardy faced controversy regarding his final resting place after death in 1928 because he wanted interment at Stinsford with his first wife Emma. His executor Sir Sydney Carlyle Cockerell insisted on Poets Corner instead and a compromise placed Hardys heart at Stinsford while his ashes rested in the Abbey.
A slate stone slab commemorates sixteen poets who died during World War One and it was unveiled on the 11th of November 1985 marking the sixty-seventh anniversary of the Armistice. Names inscribed on the slab include Wilfred Owen and Rupert Brooke among others.