The history of medieval France starts with the election of Hugh Capet (940–996) by an assembly summoned in Reims in 987. Capet was previously "Duke of the Franks" and then became "King of the Franks" (Rex Francorum). Hugh's lands extended little beyond the Paris basin; his political unimportance weighed against the powerful barons who elected him. Many of the king's vassals (who included for a long time the kings of England) ruled over territories far greater than his own. He was recorded to be recognised king by the Gauls, Bretons, Danes, Aquitanians, Goths, Spanish and Gascons. The new dynasty was in immediate control of little beyond the middle Seine and adjacent territories, while powerful territorial lords such as the 10th- and 11th-century counts of Blois accumulated large domains of their own through marriage and through private arrangements with lesser nobles for protection and support.

Hugh's son – Robert the Pious – was crowned King of the Franks before Capet's demise. Hugh Capet decided so in order to have his succession secured. Robert II, as King of the Franks, met Holy Roman Emperor Henry II in 1023 on the borderline. They agreed to end all claims over each other's realm, setting a new stage of Capetian and Ottonian relationships. Although a king weak in power, Robert II's efforts were considerable. His surviving charters imply he relied heavily on the Church to rule France, much like his father did. Although he lived with a mistress – Bertha of Burgundy – and was excommunicated because of this, he was regarded as a model of piety for monks (hence his nickname, Robert the Pious). The reign of Robert II was quite important because it involved the Peace and Truce of God (beginning in 989) and the Cluniac Reforms.

Robert II crowned his son – Hugh Magnus – as King of the Franks at age 10 to secure the succession, but Hugh Magnus rebelled against his father and died fighting him in 1025.

The next King of the Franks was Robert II's next son, Henry I (reigned 1027–1060). Like Hugh Magnus, Henry was crowned as co-ruler with his father (1027), in the Capetian tradition, but he had little power or influence as junior king while his father still lived. Henry I was crowned after Robert's death in 1031, which is quite exceptional for a French king of the times. Henry I was one of the weakest kings of the Franks, and his reign saw the rise of some very powerful nobles such as William the Conqueror. Henry I's biggest source of concerns was his brother – Robert I of Burgundy – who was pushed by his mother to the conflict. Robert of Burgundy was made Duke of Burgundy by King Henry I and had to be satisfied with that title. From Henry I onward, the Dukes of Burgundy were relatives of the King of the Franks until the end of the Duchy proper.

King Philip I, named by his Kievan mother with a typically Eastern European name, was no more fortunate than his predecessor although the kingdom did enjoy a modest recovery during his extraordinarily long reign (1060–1108). His reign also saw the launch of the First Crusade to regain the Holy Land, which heavily involved his family although he personally did not support the expedition.

The area around the lower Seine, ceded to Scandinavian invaders as the Duchy of Normandy in 911, became a source of particular concern when Duke William took possession of the kingdom of England in the Norman Conquest of 1066, making himself and his heirs the King's equal outside France (where he was still nominally subject to the Crown).