Flodoard, Annales, s.a. 957, 144; "Rotbertus, frater Heriberti, ..." Flodoard, A...

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Flodoard, Annales, s.a. 957, 144; "Rotbertus, frater Heriberti, ..." Flodoard, Annales, s.a. 960, 148. Cited by Stewart Baldwin, Henry Project.