As John Worthington says (No. 95), it needs some Oedipus to discover the identities of the contributors of the commendatory verses to the Faerie Queene. Carpenter's Reference Guide, p. 87, suggests in explanation of H.B. the following: Henry Bosvill, Sir Henry Brouncker, Henry Bedingfield, Sir Henry Bagnall, Hugh Beeston, Henry Boughton, and Sir Henry Bromly.
Commendatory verse from The Faerie Queene (1590), p. 598 (repr. in all editions):
Graue Muses march in triumph and with prayses,
Our Goddesse here hath giuen you leaue to land:
And biddes this rare dispenser of your graces
Bow downe his brow vnto her sacred hand.
Desertes findes dew in that most princely doome,
In whose sweete brest are all the Muses bredde:
So did that great Augustus erst in Roome
With leaues of fame adorne his Poets hedde.
Faire be the guerdon of your Faery Queene,
Euen of the fairest that the world hath seene.