Grosdidier de Matons suggests that Louis was the son of Comte Thierry but he cites no primary source which confirms that this is beyond doubt. A charter dated 1019, which records an agreement between Berthold Bishop of Toul and "Olricus miles", is subscribed by "Riquini comitis, Ludovicus comitis patris eius, item Ludovici filii eius, Theodorici fratris eius".
He fell ill returning from a pilgrimage to Mont-Saint-Mihiel between 1016 and 1025, and stopped at Sens where he became a monk at the abbey of Saint-Pierre to which he gave a pallium and his villa "Aricurt/Hericurt". 2
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