Diego de la Cruz: Virgin of Mercy (c. 1485), Burgos, Abbey of Santa María la Real de Las Huelgas. Titivillus appears to the right of the image.Aragonés Estella, Esperanza: "Visiones de tres diablos medievales", De Arte no. 5, 2006. .Esquivias, Óscar: "Diabluras", Diario de Burgos, 15 de diciembre de 2014, p.5. Representation on a wall painting in St Michael with St Mary's Church, Melbourne Titivillus was a demon said to work on behalf of Belphegor, Lucifer or Satan to introduce errors into the work of scribes. The first reference to Titivillus by name occurred in Tractatus de Penitentia, c. 1285, by Johannes Galensis (John of Wales). Little is known of Johannes Galensis aside from this text and a set of Decretales intermediæ. Attribution has also been given to Caesarius of Heisterbach. Titivillus has also been described as collecting idle chat that occurs during church service, and mispronounced, mumbled or skipped words of the service, to take to Hell to be counted against the offenders. He has been called the "patron demon of scribes", as Titivillus provides an easy excuse for the errors that are bound to creep into manuscripts as they are copied. For a twentieth-century subversive demon of mechanical failures, compare gremlin. In an anonymous fifteenth-century English devotional treatise, Myroure of Oure Ladye, Titivillus introduced himself thus (I.xx.54): "I am a poure dyuel, and my name ys Tytyvyllus ... I muste eche day ... brynge my master a thousande pokes full of faylynges, and of neglygences in syllables and wordes." Notes Further reading%DIFDELCMD < %DIFDELCMD < %%% Marc Drogin, Medieval Calligraphy: Its history and technique 1980. Who is Titivillus? Montañés, J. G, Tutivillus. El demonio de las erratas, Madrid, Turpin, 2015. Montañés, J. G, Titivillus. Il demone dei refusi, Perugia, Graphe.it, 2018
Diego de la Cruz: Virgin of Mercy (c. 1485), Burgos, Abbey of Santa María la Real de Las Huelgas. Titivillus appears to the right of the image.Aragonés Estella, Esperanza: "Visiones de tres diablos medievales", De Arte no. 5, 2006. .Esquivias, Óscar: "Diabluras", Diario de Burgos, 15 de diciembre de 2014, p.5. Representation on a wall painting in St Michael with St Mary's Church, Melbourne Titivillus was a demon said to work on behalf of Belphegor, Lucifer or Satan to introduce errors into the work of scribes. The first reference to Titivillus by name occurred in Tractatus de Penitentia, c. 1285, by Johannes Galensis (John of Wales). Attribution has also been given to Caesarius of Heisterbach. Titivillus has also been described as collecting idle chat that occurs during church service, and mispronounced, mumbled or skipped words of the service, to take to Hell to be counted against the offenders. He has been called the "patron demon of scribes", as Titivillus provides an easy excuse for the errors that are bound to creep into manuscripts as they are copied. In an anonymous fifteenth-century English devotional treatise, Myroure of Oure Ladye, Titivillus introduced himself thus (I.xx.54): "I am a poure dyuel, and my name ys Tytyvyllus ... I muste eche day ... brynge my master a thousande pokes full of faylynges, and of neglygences in syllables and wordes." %DIFDELCMD < %DIFDELCMD < %%% 
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Little is known of Johannes Galensis aside from this text and a set of Decretales intermediæ.
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For a twentieth-century subversive demon of mechanical failures, compare gremlin.
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Notes
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Further reading
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Marc Drogin, Medieval Calligraphy: Its history and technique 1980. Who is Titivillus? Montañés, J. G, Tutivillus. El demonio de las erratas, Madrid, Turpin, 2015. Montañés, J. G, Titivillus. Il demone dei refusi, Perugia, Graphe.it, 2018