sentences:  This set the stage for his promulgation of the Swedish-Latin Red Book, which reintroduced several Catholic customs and resulted in the Liturgical Struggle, which was not to end for twenty years.In 1575, he gave his permission for the remaining Catholic convents in Sweden to start receiving novices again.From time to time he was also at odds theologically with his younger brother Duke Charles of Sudermannia (afterwards Charles IX of Sweden), who had Calvinist sympathies, and did not promote King John's Liturgy in his duchy.