Francis Blomefield,
History of Norfolk — Chapter 14
“ In this year, Thomas de Brotherton, had a charter of the King in tail general, of the honours of Roger Bigod Marshal of England and Earl of Norfolk, by which he became constable of this castle during the King's pleasure, and it seems by his arms still remaining carved in stone on the walls, that it was he that fitted up the castle in the manner it now stands, for I think by his coat twice cut on the pilasters of the arch of the staircase, that he built that staircase, made that arch, and added the battlements which were on the top, and left the building much as we see it now. ”
