man Baudouin III Count of "@N10371@" Flanders‏‎, son of Arnold I Count of "@N10373@" Flanders and Alix de Vermandois‏.
Born ‎± 930 at Flanders, France, died ‎ Jan 1, 961/62 at (dvp)‎, approximately 31 years

The following information (and advice) is contained in a post-em from Curt Hofemann, curt_hofemann@yahoo.com:

Hie thee to Stewart Baldwin's "Henry Project" for scholarly research on this person (& much more):

http://sbaldw.home.mindspring.com/hproject/henry.htm

Baldwin III ruled briefly as joint count with his father Arnulf I, but died before his father. Count Baldwin's name appears in lists of abbots of St. Bertin [Monumenta Germaniae Historica, Scriptores series, 13, 391, 607], and he would appear to have held that office for a short period before his death. [Ref: Henry Project]

Possible illegitimate son (status uncertain):
Ascelin (Azelin) or Albert de Tronchiennes, bishop of Paris, 1016-1018.
The History of the Bishops of Cambrai states that Ascelin (or Albert, as he is called in some sources) was an illegitimate son of count Baldwin of Flanders. [Gesta Episcoporum Cameracensium, MGH SS 7, 448]. If this is accurate, Baldwin III would be the only count of Flanders named Baldwin who would make a chronologically feasible father for Ascelin. [LEon Vanderkindere, La Formation Territoriale des Principautes Belge au Moyen Age (2 vols., 2nd ed., Brussels, 1902, reprinted 1981) 1, 293], lists Ascelin as a son of Baldwin, without citing a source, but neither Erich Brandenburg, Die Nachkommen Karls des Gro

Married ‎± 951 (approximately 10 years married) to:

woman Mathilde Billung of Saxony‏‎, daughter of Hermann Billung Duke of Saxony and Hildegardis‏.
Born ‎ 937 at Saxony, Germany, died ‎ May 25, 1008‎, 70 or 71 years, ‎1st marriage to: Baudouin III Count of "@N10371@" Flanders, 2nd marriage to: Godfrey de "@N10405@" Verdun , Marquis Antwerp

Children:

1.
man Jean de Conteville , Viscomte de Comyn‏
Born ‎ 959 at of Tonsburgh & Comyn, Normandy, France‎
2.
man Arnold II Count of Flanders‏‎
Born ‎ Dec 961 at Flanders, France, died ‎ Mar 30, 987 at Chapel de St Laurent, France‎, 25 years