The front and back covers are fragments of letter of indulgence by Cardinal Brandae conceded by the pope for all crusaders against the Hussites and heretics.
Bibliography:
Tabulae codicum manu scriptorum, v. 3 (Wien, 1864-1899); catalog online at: Manuscripta Mediaevalia
Notes:
Tegumentis ambobus adglutinata sunt fragmenta litterarum cardinalis Brandae de indulgentiis concessis a Sede Apostolica omnibus cruce signatis contra Hussitas et omnes haereticos.