The aim of the article is to discuss the relations between Bolesław V the Chaste, Duke of Cracow and Sandomierz and the Canons of the Holy Sepulchre in Miechów. Almost from the beginning of the monastery’s existence, the monks of Miechów could count on the generosity of the wealthy laymen and clergy as well as dukes, which resulted in rapid growth of their estate. Bolesław V was also benevolent towards the Canons. His relations with the monastery – a foundation of the wealthy House of Griffins, were a reflection of his policy towards the House. The first privileges for the Canons were granted after the Duke’s succession to the Cracow throne and increased in the 1250’s, to decrease in the 1260’s. The monarch, trying to restrict the influence of the most important families, supported the House of Griffins’ foundation in Miechów in a less extensive way. It should be noted that the monastery in Miechów, more than any other in the Duchy of Cracow and Sandomierz, enjoyed a considerable patronage and favour of consecutive popes. All conflicts in which the Canons were a part were settled in their favour. Even Bolesław the Chaste himself was admonished by the pope because of a conflict about the estate.