N von Hevelli

http://fmg.ac/Projects/MedLands/GERMANY,%20Kings.htm#OttoIGermanyEm...

OTTO, son of HEINRICH I ...

m firstly (Sep 929) EADGYTH of Wessex

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m secondly (Pavia [Oct/Nov] 951) as her second husband, ADELAIS of Burgundy ...

Mistress (1): (before 929) --- [of the Hevelli], daughter of [BA%C3%87LABI%C4%8C [Václav] Fürst der Stodoranen & his wife ---]. According to Europäische Stammtafeln[225], she was the daughter of Baçlabić. The primary source which confirms her parentage has not yet been identified. She was a "captured Slavic noblewoman" according to Thietmar, who gives neither her name nor her parentage[226].

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1-7 Children.

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King Otto had one illegitimate son by Mistress (1):

8. WILHELM (929-Rottleberöde 2 Mar 968, bur St Alban, near Mainz). Thietmar names Wilhelm as "the offspring of a captured Slavic noblewoman and the king"[319]. He is named "Willihelmus filius regis" when recording his installation as Archbishop of Mainz in 954[320]. "Otto…imperator augustus" donated property to Aachen Marienkapelle by charter dated 16 Feb 966 which names "Maguntiensis ecclesie archiepiscopus…noster filius Willelmus"[321]. Thietmar records the death of Wilhelm Archbishop of Mainz at Rottleberode on 2 Mar, in the same year as Queen Mathilde died (in 968)[322].

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illegitim, von einer vornehmen Slavin:

Wilhelm (+ 968), Erzbischof von Mainz

http://www.genealogie-mittelalter.de/deutschland_koenige_2/otto_1_d...

From Profile "About me":

Otto I von Sachsen, Holy Roman Emperor

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http://en.wikipedia.org/wiki/Baçlabič