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In page Pope Adrian IV:

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The 16th century Jesuit commentator Augustino Oldoini, in his re-edition of Alphonsus Ciacconius' Papal History, that Adrian had authored a number of works prior to his election. These included a treatise De Conceptione Beatissimae Virginis, a monograph, De Legationae sua and a catechism for the Scandinavian church.[citation needed] Some of his correspondence survives. One such letter, from Hildegarde, exhorts him to crush the Roman commune. Joseph Baird and Radd Ehrman, editors of a collection of Hildegard's letters, note that it was "perhaps unneeded", as Adrian placed the city under Interdict almost immediately.[1][note 1] Much of Adrian's correspondence with both Archbishop Theobald and John of Salisbury has also been published in collections of the latter's letters.[2][note 2]