Final answer:
William Caxton was a merchant, diplomat, and printer who published the first edition of 'Le Morte d'Arthur'. The title of the collection is a misnomer as it includes various Arthurian tales and not just Arthur's death. Posthumous publication refers to publishing a work after the author's death.
Step-by-step explanation:
William Caxton was an English merchant, diplomat, and printer. He is connected to the Arthurian tales of Malory because he printed and published the first edition of Sir Thomas Malory's work called 'Le Morte d'Arthur'. However, the title of the collection is a misnomer because it means 'The Death of Arthur', but the collection actually contains various Arthurian tales, not just Arthur's death.Posthumous publication means that a work is published after the author has died. In the case of 'Le Morte d'Arthur', it was published after Malory's death by Caxton in 1485.