The Historia Welforum names "Heinricum I" as son of "Eticho". The Genealogia Welforum names "filium Heinricum et filiam Hiltigardam" as children of "Eticho", specifying that Hildegard married "Ludowicus Balbus imperator", although the latter is clearly incorrect. This is repeated in the Urspergensium Chronicon. According to legend, Heinrich was offered as a fief by the emperor as much land as he could plough at noon-day. Using a golden plough drawn by a relay of saddle horses, he encircled a large area while the emperor slept, hence his nickname.
He founded Kloster Altdorf in 935 at the foot of the family's main castle at Altdorf. A codex of Kloster Weingarten records that "Henricus…pater…sancti Cunradi episcopi cum uxore sua Beata et filiis sui Ethichone et Rudolfo" constructed Kloster Altorf, adding that "Beata cum filio suo Rudolfo" were buried there. 1
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