Commentary
Cawley: "FRIEDRICH, son of SIEGFRIED Comte [de Luxembourg] & his wife Hedwig --- ([970/75?]-6 Oct 1019). m ([995/97?]) [as her second husband,] --- [von Hammerstein], [widow of --- von Gleiberg,] daughter of HERIBERT Graf im Kinziggau Pfalzgraf [Konradiner] & his wife Imiza [Irmintrudis] --- ([970/85?]-). The parentage of the wife of Graf Friedrich is suggested by the Vita Adelheidis which names "Irminthrudis, Alverad [et] Berthrada" as the three sisters of Adelheid, and daughters of "Megengoz" and his wife, specifying that “Irminthrudis” was grandmother of [three of the sons of Graf Friedrich, shown below] "Heinrici magnifici ducis et Adhelberonis Metensis episcopi, Friderici ducis". Vannérus comments that “ce que nous savons maintenant de l’histoire de Gleiberg au Xe et au XIe siècle me fait adopter la filiation : I Megingaud-Gerberge ; Ermentrude = Héribert de Gleiberg ; fille = Frédéric de Luxembourg”. He does not discuss the possibility of this person’s earlier otherwise unrecorded marriage which is suggested by the Genealogia Welforum, which names [this person’s daughter] "Salice---de Glizperch Imizam nomine, Heinrici Noricorum ducis sororem et Friderici ducis Lotharingorum et Alberonis Metensis episcopi" as wife of Welf [II] Graf von Altdorf (see below). The reference to “Glizperch” appears to be the earliest indication of a relationship between the Luxembourg family and the Grafen von Gleiberg. One possibility is that the wife of Graf Friedrich was heiress of Gleiberg. However, Irmtrud/Imiza is the only one of the siblings shown below in relation to whom a reference to Gleiberg has been found. This raises the interesting possibility that Irmtrud/Imiza, while sharing the same mother as the three brothers named in the Genealogia Welforum, may have been born from a different father who presumably held Gleiberg. It should be emphasised that this suggestion is highly speculative. Another indication of a Gleiberg/Luxembourg family connection is provided by Bernold’s Chronicon which records in 1059 that “Fridericus [see below] et fratres eius de Glichberga” rebelled against “Heinrico regi”. It is not known which of Friedrich’s brothers may have been “von Gleiberg” or whether they could have been half-brothers as suggested above. Another possible indication of the family origin of the wife of Graf Friedrich is provided by the Chronicle of Alberic de Trois-Fontaines which records that "comes Letardus de Longui pater Manegaudi et Gislebertus comes de Luscelenburch" were "nepotes" of Emperor Konrad II. The precise family relationships between these three persons have not been traced, but it is likely that Giselbert was related to the emperor through his mother’s family, which had many Franconian connections. The connection with Longwy has not been found."
Family
ClaimDetailEvidence
SpouseWelf I, Count of Altdorf (e993-1030) 
Child +Kunigunde von Altorf (~1020-<1055) [S923] [S3159]
research
Attributes
ClaimDetailEvidence
GenderFemale
NameIrmtrud of Moselgau [S923]
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NameIrmtrud [Imiza] [S927] [S3159]
research
Timeline
ClaimDateDetailAgeEvidence
Birthest 994 (988-996)
 
Marriageabt 1015Welf I, Count of Altdorf (e993-1030) [S3159]
research
LivingAug 2, 1055 [S927]
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Sources
IndexTitle
[S923] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Bavarian Dukes)" (2006-7 (v1.1 Updated 11 September 2006)) (https://fmg.ac/Projects/MedLands/BAVARIA.htm).
[S927] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Luxembourg)" (2006-7 (v1.1 Updated 21 December 2006)) (https://fmg.ac/Projects/MedLands/LUXEMBOURG.htm).
[S3159] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Wurttemberg)" (https://fmg.ac/Projects/MedLands/WURTTEMBERG.htm).