Notices from the cartularies of the Ebersberg and Geisenfeld monasteries regarding the heirs of the house Sempt-Ebersberg: Williburga II, her daughter Hademoud II, and her grandson Ulrich I.
1) Cartularium Ebersbergense
Liber traditionum
[n. 44, ad annum c. 1045]
Hec eadem Ovdalrico, qui filius erat Hadamovde, filię Willipirgę, sororis Adalperonis, dedit predium Peringin et maius Wizzinvelt cum attinentibus omnibus, et partem nemoris, quę est sita ad occidentem vię, que dicitur Eckilinpurgariwec, cum venatione totius nemoris, excepto eo usu, quem antea dedit Sancto Sebastiano, sed ea pactione, ut, si idem Ovdalricus vita decedat absque prole de legali nobilique matrimonio probata, quę illi superstes fiat, omnia perpetim Eberespergensi sancto deserviant. T[estes]: Guntpold comes, Rovtperht de Sliw[isheim], Rovtperht de Gow[inacheren], Hartwic de Heida, Hart[wic] de Perchoven, Ovdarlih de Pfetarah, Rihheri de Hoh[inperc], Werinheri de Lintahi, Eppo de Nen[inpah].
[n. 52, ad annum c. 1045]
Ovdalricus comes nepos Adalperonis Sancto Sebastiano dedit dimidium mansum in villa Ucingin situm et oppidum quoddam cum adiacenti silvula pro missalibus rebus nostre basilicę, quas perdiderunt servi eiusdem Ovdalrici. Istam dationem fecit per manus Ezzonis de Ietinstetin. T[estes]: Arnolt de Undiengin, Gerhart de Furnimos. De familia: Gozperht, Walah, Dietmar, Milo, Reginhart, Perinhart.
Liber concambiorum
[n. 12, ad annum 1056]
Cum Ovdalricus marchio Chreinensis, nepos Adalperonis comitis, per traditionem Rihlindis predia Peringin et Wizzinvelt possideret, antequam nubsisset, ea tertio Heinrico cesari petenti tradidit. Que cum venerabilis Willirammus abbas secundum ius ab eo reposceret, ipse in hora sui obitus imperatrici Agneti commisit ea reddere. Pro quibus redimendis ipsa Agnes per advocatum suum Ovdalricum Sancto Sebastiano dedit de eodem predio decem mansos nobiles in diversis locis circa nemus sitos, ac quinque vineas sitas in Ibisivelde cum mancipiis et omnibus ad eos pertinentibus.
2) Monumenta Geisenfeldensia
Codex traditionum
[n. 3, ad annum c. 1060]
Noverit plebs universa, quod gloriosa comitissa Wilibirch, soror prescripti Herbehardi comitis, per manum Vodalrici marchionis tradidit ad altare Sancte Marie locum qui dicitur Eselsbach cum tribus vineis XX. et III. mancipiis silvis et omnibus iure ad ea pertinentibus in manus filie sue Gerbrige abbittise et eius advocati Haertwici, ut in cottidiana oratione sanctimonialium sui parentumque suorum frequens memoria esset ad Deum: et hii sunt testes: Wexil, Pabo, Amolt, Helemprecht.
[n. 4, ad annum c. 1060]
Eadem comitissa Wilibirch ex petitione filie sue Liutkarde tradidit ad altare Sancte Marie Sanctique Zenonis predium, quod vocatur Solari, cum fundo Ecclesie, et silva, et manicipiis VIIII. molendino et pratis, ac omnibus que ipsa ibi hereditario iure possedit, ea lege, ne cuiquam in beneficium detur, nec quoquam filie sue Liutkarde et in memoriam sue anime, defunctumque mariti Werigandi, omniumque parentum suorum sororibus ibi Deo servientibus perpetuo suffragetur.
[n. 5, ad annum c. 1060]
Eiusdem Wilibirge filia Hadmout comitissa tradidit ad altare Sancte Marie predium, quod dicitur Hadprechtsdorf, eo iure, quo ipsa possidebat, cuius rei testes sunt: Vodalrich de Forennach, Ruotprecht de Reida, Heinrick de Sunxingen, Engilram de Merimus, Folrat de Adelperendorf, Reginger de Unxenheim, Eisenreich de Burringen.
The documents attest to the marriage between Williburga II and count Werihen III. This is Williburga's only marriage attested in authentic historical sources. Hademoud II, Williburga's daughter, should thus be considered Werihen's daughter as well. Moreover, the documents attest that Ulrich I, titled as both a count (comes) and a margrave of Carniola (marchio Chreinensis), is indeed the son of Hademoud II. Combined with the evidence from the Sempt-Ebersberg family chronicle (see the edition of relevant passages here), these documents complete the family relations through which Ulrich I of Weimar-Orlamünde, margrave of Carniola (1058, see the source here) and Istria (1061, see the source here), was connected to Ulrich I of Sempt-Ebersberg, the count of the march of Carniola from 1011 (see the source here).
It should be noted that there are absolutely no sources that would confirm the marriage between Hademoud II and Poppo II of Weimar-Orlamünde. The connection between the house Weimar-Orlamünde and Sempt-Ebersberg is attested only indirectly by Lampert of Hersfeld and the so-called Annalista Saxo, an anonymous 12th-century Saxon chronicler (see the edition of the relevant passages and the family tree here).
See the family tree here.