Rudolf of St Trond

Rudolf of St Trond (also Rodulf, Rodolfus, Rodolphe, Radulphus, Rudolph, or Raoul, c. 1070–1138) was a Benedictine abbot of St Trond Abbey, chronicler and composer.[http://utopia.knoware.nl/users/ikedl/chant/ike/composers/Radulphus_de_StTrond_comp.htm Radulphus of St. Trond]

A musical treatise Quaestiones in musica was attributed to him by the musicologist Rudolf Steglich;Rudolf Steglich, Die Quaestiones in musica: ein Choraltraktat des zentralen Mittelalters und ihr mutmasslicher Verfasser, Rudolf von St Trond (1070–1138) (Leipzig, 1911/R) another suggestion is Franco of Liège.Dolores Pesce, The Affinities and Medieval Transposition (1987), pp. 39-40.

He wrote a chronicle Gesta Abbatum Trudonensium, on the abbots of his abbey, beginning in 999;[http://perso.infonie.be/liege06/04quatrez.htm Sources] it is included in the Paleographie musicale and the Monumenta Germaniae Historica. His description of monastic life includes details of musical practice and training methods of Guido of Arezzo.{{Cite Grove |last=Anderson |first=Gordon A. |last2=Balensuela |first2=C. Matthew |title=Rodolfus of St Truiden|name-list-style=amp}} Historian Henri de Lubac wrote that he showed "a very exacting and almost combative idea of historical truth."Medieval Exegesis (1988 translation), p. 73.