Inscription after Edmund Spenser's The Faerie Queene Book III Canto III, LIX-LX (http://www.bartleby.com/153/58.html):
In th'evening late old Glaucé thither led
Faire Britomart, and that Queen's armoury
Down taking her therein appareled
Both spear she took, and shield, which hong by it
One of the six stained glass Britomart Windows at Cheltenham Ladies’ College

"The GRAND STAIRCASE, of 1881-2, by the former entrance,
has a good collection of late C19 stained glass by Heaton, Butler & Bayne,
notably the Britomart windows on the first floor,
two of which are the most intricate designs of Frederic Shields"
Nikolaus Pevsner: The Buildings of England. Gloucestershire. The Vale and the Forest of Dream. Penguin 2002 p. 254 books.google

See also Dorothea Beale: Britomart, or Spenser's Ideal of Woman, in: Literary Studies of Poems, New and Old, London 1902, pp. 25-51 archive.org