Editing Pope Adrian IV (section)

===Writings===
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|date=July 2021}} 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.{{sfn|Baird|Ehrman|1994|pp=20, 44}}{{refn|This particular letter has been described as expressing "ideas which are themselves highly abstruse...where either the imagery is so contorted as to be intelligible only to the recipient, if in fact even to him, or as to be deliberately indecipherable", as it contains references to a large number of [[allegorical]] animals.{{sfn|Baird|Ehrman|1994|pp=20, 44}}|group=note}} Much of Adrian's correspondence with both Archbishop Theobald and John of Salisbury has also been published in collections of the latter's letters.{{sfn|Millor|Butler|1986|pp=ix–xii}}{{refn|In an early letter, Theobald berates Adrian for sending a messenger who "has either betrayed his trust out of malice or lost them [Theobald's letters] through negligence or has falsely pretended that they were lost", and advises Adrian to "speak to your messenger at your good pleasure and, if it please you, give him instructions to carry out your business with greater caution and fidelity".{{sfn|Millor|Butler|1986|p=20}}|group=note}}

Adrian's episcopal registry is now lost,{{sfn|Freed|2016|p=142}} although some decretals—formal rulings—survive.{{sfn|Morris|1989|p=402}}{{sfn|Heather|2014|p=401}}{{refn|This compares, however, to 713 from Alexander III's pontificate.{{sfn|Morris|1989|p=402}}{{clarify|date=June 2020}}|group=note}} These covered such questions as to whether it was possible to restore a priest to his office when he had been responsible for the death of an apprentice, the payment of [[tithes]], and the marriage of the unfree. Adrian's thoughts on tithe payment also made their way into the body of Canon Law,{{sfn|Duggan|2003b|p=185}} and were, according to Duggan, "recognised by contemporaries as having special significance, and so included in the collections of canon law being assembled at the time".{{sfn|Duggan|2003b|p=185}}