Medical Works
One of the most comprehensive recipe books for pre- and post-coital contraception was written by a "Pedro Hispano", who offered advice on birth control and how to provoke menstruation in his immensely popular Thesaurus Pauperum (Treasure of the Poor). Many of Peter’s recipes have been found surprisingly effective by contemporary research, and it is believed that women in antiquity had more control over their reproduction than previously believed. It is not clear, however, whether the author of the Thesaurus Pauperum was indeed the same person as Pope John XXI.
Read more about this topic: Pope John XXI
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