Ancestor of Louvain Lambert was at home I barbate (ok.950 - 12 September 1015), the second son of Rainier III, Earl Eno. After the death of Emperor Ottone I Lambert I, along with older brother Regnier IV, supported by King Lothar of France, decided to take advantage of the unrest in the Empire and restore paternal possession, seized the emperor in the year 958. They attacked the Lorraine in the year 973, by the adherents of the emperor. Only in 974, the Emperor Ottone II was able to force them to flee to France. In the year 976, they then try to return to ancestral ownership, but again failed. Soon, however, the emperor decided to peremanit Rainier and Lambert at his side, returning the confiscated property of his father. As a result, in 988 the county Louvain Lambert was allocated from the former County of Hainaut.

   Nearly 994 years Gerberge Lambert married the daughter of the Duke of Lower Lorraine Charles I. As it was given to county Brussels (region between the Seine and Dolem). In addition, he has become a secular Abbot NIVEL and Gemblua. These acquisitions formed the basis of his descendants. After the death of the Duke of Lower Lorraine Otton in 1012 Lambert unsuccessfully lay claim to the dukedom, but the Emperor Heinrich II transferred his column VERDUN Gottfried. Lambert tried to increase their ownership by the diocese of Liege, but met the opposition of Duke Gottfried, break it in 1013 in the Battle of Gugarde. Around Lambert joined his family - Namur Count Robert II and count Henault Renie V (son of the deceased in 1012 his brother Lambert, Rainier IV). In 1015 Lambert once again confronted with the Duke Gottfried died in the Battle of Florene.

   Lambert succeeded his elder son Heinrich I (um. 1038). He continued, in alliance with Renie V d'Eno fight Gottfried Lorraine and supporters of the Emperor Henry II, his father started. But in 1018 under the mediation of Bishop Gerard was Kambre world, bound by marriage Rainier V and niece of Duke Matilda. From this moment, Heinrich became a supporter of the Duke of Lower Lorraine and the emperor. In 1037 he participated on the side of the emperor in the war for the inheritance of Burgundy. Heinrich was killed in 1038.

   After the short rule son of Henry I, Ottone (um.1040) Louvain Brussels and moved to his brother Henry, Lambert II (um. June 19, 1054). He continued the policy of his father, to increase holdings, sometimes to the detriment of the spiritual and imperial power. In 1054 Lambert had joined the rebellion Baldvin V Flandrskogo against the Emperor Henry III, but died in the battle against the imperial army near ournai.

   On board the son of Lambert II, Henry II (1020-1078) little is known. Inherited his eldest son Heinrich III (um.1095) is mainly controlled by their possessions, to eradicate banditry in their lands. After his death in 1085 palsgrave Lorraine Herman II, he received landgrafstvo Brabant (area between the Seine and Dandrom). And in 1095, Heinrich was killed at the Knights' tournament in Tournai, leaving only daughters. He succeeded his younger brother Gottfried I barbate (around 1060 - January 25, 1139). In 1101 Godfried able to inherit Antwerp brand.