 His only known published music is a set of secular "Cantiones" for three voices which were published in Hamburg in 1608 under his Latinized name, Theodoricus Sistinus.He was also known under the name Trudo Haggaei Malmogiensis.Little is known about Aagesen's early life but his musical mentor and spiritual adviser was Norwegian-born Jesuit Laurentius Nicolai with whom he studied music.