Joseph Brassinne, Catholic Encyclopedia (1913)
“ He was one of the first to spread the observance of All Souls' Day, which he authorized for his diocese. But the most notable characteristic of Notger's administration was the development which, following up the work of Heraclius, he gave to education: thanks to these two bishops and to Wazo, "Liège for more than a century occupied among the nations a position in regard to science which it has never recovered". "The schools of Liège were, in fact, at that time one of the brightest literary foci of the period". ”
