"Capella Episcopi juxta Sanctum Paulum," 31 Ed. I. (Lib. Cust. I. 229).
Dugdale mentions a Chapel in the Bishop's Palace (Dugdale's St. Paul, 134).
He speaks of the lower Chapel, as if there were two, and it was probably built with a crypt underneath, which was also used as a chapel.
The Chapel seems to have been known at one time as the Chapel of St. Mary.
A Dictionary of London. Henry A Harben. 1918.