Gregory IX, Pope. [Letter to Agnes of Prague, 1238 (2)] in Bullarium Franciscanum Romanorum Pontificum 1.236-7

[Letter from Pope Gregory IX to Agnes of Prague]
After almost three years of struggle, and appeals to Clare and to king Wenceslas, her brother, Agnes finally wins Gregory's grant of the privilege of poverty to her monastery.
Online at Epistolae (See also Bibliographia record).