As explained by Nonn, there are very few, if any, clear records of counts of all Hainaut in the 10th century. The region is associated by many historians such as
Leon Vanderkindere with the so-called
Reginarid dynasty who were a powerful and rebellious
Lotharingian family, known for their frequent use of the name Reginar. This is because later in the 10th century a branch of this family succeeded to take the county by force, after returning from exile. However, while the later family clearly claimed to have once had important rights throughout Lotharingia, the exact nature of most of these is unclear, and their possession of a county in Hainaut before Reginar III can not be proven. The only medieval record which claims that
Reginar I held an office involving all of Hainaut was the much later
Dudo of Saint-Quentin, who is considered to be unreliable for this period. He names Reginar as "Duke" (Latin
dux) of both
Hesbaye and Hainaut, and discusses his march against
Rollo in
Walcheren, together with a Frisian ruler named Radbod, at some point in late 9th or early 10th century. The late 14th century
Annales Hannoniae, which give legendary origins of the Counts of Hainaut, describes this Reginar I as a count of Mons – a title held by his descendants.The first recorded count who was associated as a count with any part of Hainaut in a contemporary record was
Count Sigehard.
Leon Vanderkindere proposed that this Sigehard was given the county while Reginar I was out of favour. In fact no such connections can be proven. He was more clearly described as a count in the
pagus Liugas, east of
Liège. • 902. The county of Sigarhard included
Wandre and
Esneux in the
pagus of Liège (
in pago Leuchia in comitatu Sigarhardi). • 908. He was recorded once as a count who was present agreements made about both
Lobbes Abbey (
Laubacensum abbatiam), which was described as part of the county and
pagus of Hainaut (
in pago ac in comitatu Hainuensi sitem), and Theux, which was described as being in the
pagus and county of Liugas (
in pago ac in comitatu Liwensi positum).[https://www.dmgh.de/mgh_dd_zwent__dd_ldk/index.htm#page/184/mode/1up • 915. Theux is described as being both in the
pagus of Liugas and the county of Sigehard (
in pago Leuviensi atque in comitatus Sichardi sitam). • 916 and 919, Sigehard appears in two documents of West Francia king
Charles the Simple dated at
Herstal near Liège. • 920. Sigehard was also recorded as a "venerable" count in a document concerning
Crespin Abbey, concerning a grant.. According to Nonn, the record shows that he had held the land involved. From 925, Lotharingia, including Hainaut, was continuously part of the eastern Frankish kingdom which was the predecessor of the
Holy Roman Empire. In 939, the Reginars led a rebellion against the eastern kingdom which was defeated.
Gilbert, Duke of Lorraine, the son of Reginar I who had been leader of this rebellion, was killed. Reginar II (died before 943), the younger son of Reginar I, was named as a Count of Hainaut in the late 11th-century life story (
Vita) of
Gerard of Brogne (died 959), but this work is considered unreliable, and we can not be certain of this position. His son
Count Reginar III Longneck, may also have been a count in Hainaut. What is more certain is that he unsuccessfully rebelled against Duke
Bruno the Great, so he was deposed from all offices, exiled and
banned in 958. The
Vita of Gerard of Brogne also names him as a count of Hainaut. Ulrich Nonn considers it likely that he held Mons because it aligns with other evidence. A count named Amelric who was "from" the pagus of Hainaut (Latin: ) is named in or after 953 in the
Deeds of the bishops of Cambrai. This is generally taken to mean that Hainaut already included the jurisdictions of more than one count. Apart from the one associated with Mons, Amulric perhaps held a county based in Valenciennes. The second or third count of Hainaut to be named in a contemporary record was however called Godefrid, starting in 958, the year of Reginar III's exile. He is generally considered to be
Godfrey I, Duke of Lower Lorraine who died in 964 in Italy. After the death of Godfrey in Italy, he was replaced in Hainaut by a
Count Richer, who was perhaps the same Count Richer who held a county in the
pagus of Liège. In 972 he died. In 973 two noble brothers,
Werner and Reynold, were killed near Mons fighting the two sons of Reginar III,
Reginar IV and
Lambert, who had returned to claim their father's property. Also in 973, Counts named Amelric and Richizo appeared in a royal grant in favour of Crispin Abbey in Hainaut. Amelric is probably the count of 953 mentioned above, with his seat in or near Valenciennes. According to Hlawitchka, Richizo is probably Richwin, a brother of Count Richer who died in 972. The Regnarid brothers apparently did not succeed in gaining Hainaut, or even Mons for some decades. The
Gesta of the bishops of Cambrai records that two counts named Godefrid and Arnulf succeeded Richizo and Amelric, and these two counts were involved in a defense of Cambrai in 979, and appear in other records. They are believed to be the same as
Count Godfrey "the captive", and
Arnulf of Valenciennes. In 998 the Reginar IV regained control over the County of
Mons, in Hainaut, from Godfrey according to
Alberic of Trois-Fontaines. Historian Michel de Waha believes this late report can not be trusted, and that we can only say they took control in the period 985–1015, and probably after 1007. Reginar IV died 1013, and was succeeded by his son Reginar V. Reginar IV's brother Lambert, who made himself Count of Louvain, died in battle in Hainaut in 1015. The County of Valenciennes disappears from records after the death of Arnulf of Valenciennes in about 1011, with this part of Hainaut possibly being taken over by the County of Flanders. ==High Middle Ages (1000–1250)==