The Vita Adelheidis names "Irminthrudis, Alverad [et] Berthrada" as the three sisters of Adeleid, daughters of "Megengoz" & his wife, specifying that Irmintrudis was grandmother of "Heinrici magnifici ducis et Adhelberonis Metensis episcopi, Friderici ducis". Her birth date range is estimated from the birth date of her mother. The Memorial of "Megendaudus…Gerbirga marito" also names "Irmendrudis", recording that she was born with them, presumably indicating that she was their daughter, with the name "Adelheidis abbatissa" recorded at the end out of context. 1
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