Christian Raffensperger has suggested that there might be some truth to this story, based on a reference to the death of one of Henry’s sons in Donizo’s Vita Mathildis (written c.1115).
Christian Raffensperger menyarankan bahwa mungkin ada beberapa kebenaran dari cerita ini, berdasarkan referensi kematian salah satu putra Heinrich di Donizo's Vita Mathildis (tertulis skt. tahun 1115).