Arnold II is a Count of Boulogne

Count of Boulogne

The county of Boulogne was a historical region in the Low Countries. It consisted of a part of the present-day French département of the Pas-de-Calais , in parts of which there is still a Dutch-speaking minority....

 identified by Morton and Muntz (page xxxi note 7) as the one slain in battle by Count Enguerrand I

Enguerrand I of Ponthieu

Enguerrand I was the son of Hugh I count of Ponthieu.He was apparently married twice. By his first wife Adelaide, daughter of Arnulf, Count of Holland he had his heir, count Hugh II, and possibly a son named Robert...

 of Ponthieu

Ponthieu

Ponthieu was one of six feudal counties that eventually merged together to become part of the Province of Picardy, in northern France. Its chief town is Abbeville.- History :...

. Frank Barlow

Frank Barlow (historian)

Frank Barlow CBE FBA FRSL was a British historian, known particularly for biographies of medieval figures.Barlow studied at St John's College, Oxford. He was Professor of History at the University of Exeter from 1953 until he retired in 1976 and became Emeritus Professor...

 (page xliii note 125) prefers to retain the traditional identification of the slain count as Baldwin I of Boulogne. However, he admits that the identification is "uncertain." In any case, the widow (Adelvie?) of Baldwin / Arnold then married Count Enguerrand I.

Sources

• The Carmen de Hastingae Proelio
  The Carmen de Hastingae Proelio
  The Carmen de Hastingae Proelio is an early written source for the Norman invasion of England from September to December 1066, in Latin; attributed to Bishop Guy of Amiens, uncle to Count Guy of Ponthieu, who figures rather prominently in the Bayeux Tapestry as the vassal of Duke William of...
  
   of Guy Bishop of Amiens
  Guy Bishop of Amiens
  Guy, Bishop of Amiens was an eleventh century churchman, in what is now the north-east of France.Although the genealogy of early Ponthieu and Boulogne is scanty , it is most likely that Guy, the Bishop of Amiens, was the uncle Guy, Bishop of Amiens (d.1075) was an eleventh century churchman, in...
  
  , edited and translated by Frank Barlow, Clarendon Press, Oxford, 1999.

• The Carmen de Hastingae Proelio of Guy Bishop of Amiens, edited by Catherine Morton and Hope Muntz, Oxford at the Clarendon Press, 1972.