In 1226, following the death of his father Waleran III, Henry inherited the County of Arlon. In 1240 Henry married
Margaret, daughter of
Henry II of Bar and
Philippa of Dreux. Henry's marriage to Margaret brought him
Ligny-en-Barrois as her
dowry, though, by a clause in the marriage contract, it remained under the feudal suzerainty of the
County of Bar. In contempt of this, Henry paid homage in 1256 to King
Theobald II of Navarre in the latter's capacity as
Count of Champagne. Henry's brother-in-law Count
Theobald II of Bar took advantage of the conflict then raging between Duke
Frederick III of Lorraine and the
bishops of Metz. Henry V was a partisan of the duke and so Theobald took the side of the bishop. Henry was captured in battle at
Prény on 14 September 1266. On 8 September 1268, King
Louis IX of France arbitrated between the two counts and Henry was freed and repossessed of Ligny, but under the suzerainty of the Barrois. Henry inherited Luxembourg and Laroche following the death of his mother, Ermesinde, in 1247. In 1256, Henry seized Namur while the reigning margrave,
Baldwin II, was also reigning
emperor in
Constantinople. Baldwin sold his rights to Namur to
Guy, Count of Flanders, who retook the margraviate from Henry. The two parties made peace and Guy married Henry's daughter,
Isabelle. Upon receiving 15,000
tournois from the Pope, Henry joined
Edward of England on the
Ninth Crusade. He returned with his remaining retainers after the crusaders achieved a truce with the
Mamluk Sultanate. == Issue ==