Career
After obtaining a degree in philosophy at the Pedagogy of the Lily in Leuven University, Bertelius was elected abbot of the Altmünster Abbey, Luxembourg, in 1573 and consecrated in 1576. On his orders the relics of John the Blind, Duke of Luxembourg and King of Bohemia, were buried there. In 1595 king Philip II of Spain appointed him abbot of the Benedictine monastery of Saint Willibrord at Echternach.
The following year the abbey was pillaged by Dutch freebooters and Bertelius was taken prisoner and removed to Nijmegen.
He was released only after a ransom payment. After his return, he devoted himself to literary work until his death.
He was buried in a chapel of the monastery at Echternach.