His wife Irmengard founded Lichtenthal Abbey in Baden-Baden in 1245, which later became the burial place of the margraves.
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In 1248, Irmengard transferred her husband's body from Backnang Abbey to Lichtenthal Abbey.
He returned to his abbey in Maria Laach and later to Beuron, but a serious heart disease forced him to move to the Cistercian abbey of Lichtenthal near Baden-Baden to receive medical help.