Nielsen Hayden genealogy
Udo

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Name Udo Birth Abt 835 [1] Gender Male Death Aft 879 [1] Person ID I688 Ancestry of PNH, TNH, and others | Ancestor of AP, Ancestor of DDB, Ancestor of DGH, Ancestor of DK, Ancestor of EK, Ancestor of JMF, Ancestor of JTS, Ancestor of LDN, Ancestor of LMW, Ancestor of TNH, Ancestor of TSW, Ancestor of TWK, Ancestor of UKL, Ancestor of WPF Last Modified 6 Jan 2018
Children + 1. Conrad the Elder d. 27 Feb 906, near Fritzlar, Hesse, Germany + 2. Eberhard d. Between 902 and 903 + 3. Gebhard, b. Abt 870 d. 22 Jun 910 (Age ~ 40 years) Family ID F244 Group Sheet | Family Chart Last Modified 16 Jun 2018
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Notes - Count in the Lahngau.
Peter Stewart, 9 April 2017, post to soc.genealogy.medieval:
You would be better off discarding any website that refers to 'Udo of Neustria' -- this designation is completely spurious.
The person in question belonged to the Konradian family in eastern Francia (i.e. modern Germany). Udo was count in the Lahngau, except for a few years in the early 860s when he had to make himself scarce in his homeland and along with his brother Berengar he fetched up in Neustria under the aegis of their uncle Adalard the Seneschal. In that brief interval Adalard evidently held one of two marks (or marquisates) in Neustria, especially charged with defense against the Normans. Udo and Berengar held 'honores' under their uncle's authority, probably in the region of Le Mans. This arrangement did not last long and they were relieved of their posts in 865.
Udo's wife is unknown, either by name or by family origin. It is thought she may been a uterine half-sister, or perhaps a cousin, of Emperor Arnulf, since Udo was most probably the father of Konrad the Elder, also a count in the Lahngau, who was called 'nepos' by Arnulf.
- Count in the Lahngau.
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Sources - [S49] Genealogics by Leo Van de Pas, continued by Ian Fettes and Leslie Mahler.
- [S49] Genealogics by Leo Van de Pas, continued by Ian Fettes and Leslie Mahler.