According to Peter Damian, Landulf was an imperial chaplain, before Henry II appointed him bishop of Turin.
[2] In January 1015, Landulf was in Rome, where he witnessed Pope Benedict VIII’s confirmation of the Abbey of Fruttuaria’s ‘apostolic liberty’.
[3] In 1017 Landulf made a donation to the episcopal convent of San Pietro in Turin.
[4] In 1022, Landulf was present at the synod of Pavia, presided over by Benedict VIII and Henry II.
[5] Around 1028 Landulf worked with Ulric Manfred II of Turin, Bishop Alric of Asti, and Archbishop Aribert of Milan to combat heresy at Monforte.