House of Reginar

The House of Reginar (later known as the House of Brabant) was a kin-group in Lotharingia during the Carolingian and Ottonian centuries. They were the first dynasty of the County of Hainault and they supplied two Dukes of Lorraine and the Landgraves and later Dukes of Brabant, Dukes of Lothier and Dukes of Limburg. The main branch extinguished in 1355, leaving its duchies to the House of Luxembourg which in turn left them to the House of Valois-Burgundy in 1383. A side branch is the House of Hesse which ruled Hesse from 1264 until 1918 and is still existing today.

History
Their eldest ancestor is Gilbert, Count of the Maasgau (mentioned in 841) who served King Lothair I, but defected to Lothair's half-brother Charles the Bald during the civil war of 840-843. In 846 Gilbert abducted an unnamed daughter of Lothair and married her in an attempt to force Lothair to reinstate him. Gilbert's son is believed to be Reginar, Duke of Lorraine (c. 850–916). Following the death of Charles the Fat, the Reginarids began a long fight with the Conradines for supremacy in Lotharingia. When they triumphed, in 910, it was in electing Charles the Simple as king. It was the combined forces of Bruno I of Lorraine and the Carolingians of West Francia that finally broke the Reginarids' hold on power. In 958, Reginar III had his lands confiscated and redistributed to Gerard, Count of Metz, of the Matfridings, enemies of his family since the reign of Zwentibold.

The Reginarids supported Lothair of France against Otto II, but they made a deal with the latter in 978. Nonetheless, the Reginarids were not longer a unified family by the end of the tenth century. Their descendants in Mons and Louvain continued their spirit of opposition to the king, however. The house also produced a queen-consort of England in the form of Adeliza of Leuven, who married Henry I of England.

Rulers
Dukes of Lorraine
 * Reginar (910–915)
 * Gilbert (915–939)

Counts of Hainaut
 * Reginar I (r. ?-898 and 908-915)
 * Reginar II (r. 915-after 932)
 * Reginar III (r. before 940-958)
 * Reginar IV (r. 973-974)
 * Reginar V (r. 1013-1039), acquired the southern part of the Brabant province around 1024
 * Herman (r. 1039-1051), married Richilda, acquired Valenciennes around 1045 or 1049

Counts of Leuven, Counts of Brussels
 * 1003–1015 : Lambert I, was the first Count of Louvain, son of Reginar III Count of Hainaut
 * 1015–1038 : Henry I, (son of Lambert I)
 * 1038–1040 : Otto
 * 1040–1054 : Lambert II, (son of Lambert I)
 * 1054–1079 : Henry II, (son of Lambert II)
 * 1079–1086 : Henry III, (son of Henry II)

Dukes of Lower Lorraine
 * Godfrey I of Leuven (1106–1129) (also known as Godfrey V), brother of Henry III, Count of Louvain
 * Godfrey II of Leuven (1139–1142) (also known as Godfrey VI)
 * Godfrey III of Leuven (1142–1190) (also known as Godfrey VII)
 * Passes to Henry I, Duke of Brabant (1190–1235), see below: Duke of Brabant

Counts of Leuven, Counts of Brussels and Landgraves of Brabant:
 * Henry III (1085/1086–1095); already Count of Leuven and Brussels from 1078.
 * Godfrey I (from 1095)

Counts of Leuven, Counts of Brussels, Landgraves of Brabant, Margrave of Antwerp and Dukes of Lower-Lorraine:
 * Godfrey I (1106–1139) appointed as Duke in 1106
 * Godfrey II (1139–1142)
 * Godfrey III (1142–1190)

Dukes of Brabant and Dukes of Lothier:
 * Henry I (1190–1235); already Duke of Brabant from 1183/1184
 * Henry II (1235–1248)
 * Henry III (1248–1261), his younger half brother Henry I, Landgrave of Hesse inherited Hesse from his mother and became the founder of the House of Hesse
 * Henry IV (1261–1267)

Dukes of Brabant, Dukes of Lothier and Dukes of Limburg:
 * John I (1267–1294)
 * John II (1294–1312)
 * John III (1312–1355)
 * Joanna (1355–1406), married Wenceslaus I, Duke of Luxembourg