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.
[1] A musical treatise Quaestiones in musica was attributed to him by the musicologist Rudolf Steglich;[2] another suggestion is Franco of Liège.
[3] He wrote a chronicle Gesta Abbatum Trudonensium, on the abbots of his abbey, beginning in 999;[4] 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.
[5] Historian Henri de Lubac wrote that he showed "a very exacting and almost combative idea of historical truth.