SIR WILLIAM HARBERT wrote Sidney, or Baripenthes, briefely shadowing out the rare and never-ending laudes of that most honorable and praise-worthy gent. sir Philip Sidney knight: printed by John Windet, 1586, 4to. Also A prophesie of Cadwallader, last king of the Britaines, containing a comparison of the English kings, with many worthy Romanes, from William Rufus till Henry the first, &c. inscrib'd to sir Philip Herbert. Printed by T. Creede, 1604, 4to. There is, likewise, something by him in The phoenix nest, 1593: and a poem before Erondells French garden, 1605, "In laudem authoris."
He is call'd "Sir William Harbert knight," in The typographical antiquities, but by Wood "one William Herbert."