In the year of the Lord 1450, Peter de Mera, Chamberlain to our Lord Eugenius IV, obtained a letter granting Indulgence to our House, namely, to the Prior, the Brothers, the Converts, the Donates, and the Oblates in the House on Mount St. Agnes; and the purport of his letter was as followeth:
“Most blessed Father and most holy Lord, This petition is made to further the salvation of the souls of your devout servants Theodoric the Prior, the Canons or Brothers, and the other members of the community who dwell in the Monastery on Mount St. Agnes, near Zwolle, following the rule of the Order of Canons Regular, which monastery is in the diocese of Utrecht: likewise on behalf of the servants of this same House, and of other Priors, Canons, Brothers, members of the community, and servants, who shall dwell from time to time in the aforesaid monastery; wherefore that in future they may be ordered in more wholesome wise we beseech your holiness to deign of your grace to grant them Indulgence to the effect following, namely, that as long as they continue in the verity of the faith, the unity of the Holy Roman Church, in obedience and in devotion to your holiness and your successors, the Chief Pontiffs of the Holy Roman Church, who shall be canonically elected, so long a suitable Confessor chosen by them shall have power under the authority of the Apostolic See to grant to them when in articulo mortis full remission of all sin which they may have confessed with contrition of heart. Provided always that they presume not to do any unlawful thing through their reliance upon this Indulgence, and provided also that so soon as they are notified of this Indulgence they keep fast on every Friday for one whole year, or do some other act of piety: but if they have neglected to fast or been unable to do so, or if it hath been their custom heretofore so to fast on every Friday, then they shall be bound to perform some other special act of grace in accordance with the directions of the aforesaid Confessor.