Which theological books did Lothar of Segni write before becoming pope?

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During the 1190s, before he was elected pope, Lothar of Segni (later Innocent III) wrote three theological tracts:

  • De miseria condicionis humane (On the Misery of the Human Condition)
  • De missarum mysteriis (On the Mysteries of the Mass)
  • De quadripartita specie nuptiarum (On Four Types of Marriage)

These works demonstrate his ability to use the Bible to understand Christian institutions in original ways and reveal that his theological training in Paris significantly shaped his worldview.1