There is no primary source which directly proves that Ermengaud was the son of Odon Comte de Toulouse. However, two documents suggest that this affiliation is probably correct. Firstly, Catel records a donation by "Deda religieuse" "tant pour elle que pour le comte Ermengaud et Adelays sa femme et ses enfants, que pour le comte Pons", by charter dated to [930]. Secondly, Flodoard records that "Ragemundus et Ermingaudus, principes Gothiæ" swore allegiance to Raoul King of France in 932.
Comte de Rouergue 906. Agio Archbishop of Narbonne wrote to "Agamberto necnon et Elefonso episcopus" by undated charter which names "comites nostros Ermingaudum et Raimundum". This charter is dated to 922 in the third edition of the Histoire Générale de Languedoc. However, the fact that Ermengaud is given precedence over Raymond in the document suggests that the latter must have been Raymond Pons Comte de Toulouse, nephew of the former, rather than his older brother Comte Raymond II. If that is correct, the document would be dateable to after [924]. Archbishop Agio died in [926/27], which if correct would be place the document in [924/27]. "Ermengaudus comes et filius suus Regimundus et Rainus vicecomes et vicarius" donated property "in pago Ruthenico in ministerio Curiense in villa…Seviniaco" to Vabres by charter dated Jan [934], subscribed by "…Ugone filio Ermengaudo, Bernardo vicecomite, Ildoino, Adalone". "Ermengaudus comes et uxor mea Adalais comitissa" donated property "in pago Ruthenico" to Vabres by charter dated Jul 935, subscribed by "Adalone, Elduino, Genesio, Ugone filio Adalone, Ermengaudo fratre suo, Bernardo vicecomite". 2
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