Who is Auberon of Dom-Daniel, from A Midsummer Night's Dream from The Sandman and what is their importance?

Auberon is the fairy king, consort of Lady Titania, who accompanies her to view Shakespeare's play "A Midsummer Night's Dream" at the request of the Sandman. Auberon is impressed with Shakespeare's writing. When Shakespeare asks for money for the company, Auberon gives him a bag of gold which, in the morning, turns out to be filled with yellow leaves.