Gregory IX, Pope. [Letter to Agnes of Prague, 1238 (3)] in Bullarium Franciscanum Romanorum Pontificum 1.240-41

[Letter from Pope Gregory IX to Agnes of Prague]
The pope sends a change in the regulations for fasting, which Agnes felt did not conform to Francis's directives. She wrote to Clare for clarification, see Clare's third response to Agnes.
Online at Epistolae (See also Bibliographia record).