The angel above represents Victory and the angel below represents Sorrow.
In the stained glass window (1878), designed by William Morris and executed by Edward Burne-Jones, the figure centered between these blue-winged angels is St. Catherine of Alexandria. If you have a chance to research her story, you’ll understand why both sorrow and victory were paired.
The face of St. Catherine is that of Edith Liddell. Her sister was the inspiration for Alice in the book, Alice in Wonderland.