"Hludowicus…imperator augustus" granted the abbey of San Salvatore to "nostra coniux…Angilberga ante filiam…nostrum Hermengardem" by charter dated at Venosa 28 Apr 868.
Betrothed (869, contract broken autumn 869) to co-Emperor Konstantinos, son of Emperor Basileios I & his first wife Maria. This betrothal sealed the alliance between the fathers of the two parties, but was annulled after the alliance broke down in 871.
Regino records the marriage of "Hirmingardem filiam Hludowici imperatoris" and "Bosoni germano Richildis reginæ". "Ludowicus…rex" granted "nepta nostra Hirmingarda" property at Morcula and Almenno in the county of Bergamo by a charter dated 26 Feb 875.
Abbess of San Salvatore at Brescia 878. She married without her father's knowledge and against his wishes. "Boso…et coniunx mea Hirmingardi proles imperiales" donated property "in pago Laticense…in villa Lantinus" to the abbey of Montiérender by charter dated 25 Jul 879, subscribed by "Richardi comitis, Teutbaldi comitis, Bernardi comitis". She was regent for her son King Louis from 890. 1
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