Whomever Browning may have had in mind, there was no historical figure with this name and place.
Hist, but a word, fair and soft!
Forth and be judged, Master Hugues!
Answer the question I've put you so oft:
What do you mean by your mountainous fugues?
See, we're alone in the loft,—
I, the poor organist here,
Hugues, the composer of note,
Dead though, and done with, this many a year:
Let's have a colloquy, something to quote,