Odo of France in the context of Robertian dynasty

Robert the Strong (French: Robert le Fort; c. 830 – 866) was the father of two kings of West Francia: Odo (or Eudes) and Robert I of France. His family is named after him and called the Robertians. In 853, he was named missus dominicus by Charles the Bald, King of West Francia. Robert the Strong was the great-grandfather of Hugh Capet and thus the ancestor of all the Capetians.

The siege of Paris of 885–886 was part of a Viking raid on the Seine, in the western part of the Frankish Empire. The siege was the most important event of the reign of Charles the Fat and a turning point in the fortunes of the Carolingian dynasty and the history of France. It also proved for the Franks the strategic importance of Paris at a time when it also was one of the largest cities in West Francia. The siege is the subject of an eyewitness account in the Latin poem Bella Parisiacae urbis of Abbo Cernuus.

With hundreds of ships, and possibly tens of thousands of men, the Vikings arrived outside Paris in late November 885, demanding tribute. This was denied by Odo, Count of Paris, despite the fact he could assemble only several hundred soldiers to defend the city. The Vikings attacked with a variety of siege engines but failed to break through the city walls despite days of intense attacks. The siege was maintained for months but without any significant assaults after the initial attack. As the siege continued, most of the Vikings left Paris to pillage further upriver. The Vikings made a final unsuccessful attempt to take the city during the summer. In October, Charles the Fat arrived with his army.

The Robertians (sometimes called the Robertines in modern scholarship) are a proposed Frankish noble family and royal dynasty, whose members were ancestors of the Capetian dynasty that ruled over the Kingdom of France and several other countries (currently Spain and Luxembourg). Prominent Robertian ancestors of the Capetian dynasty appear in historical records as powerful nobles serving under various rulers of the Carolingian dynasty, mainly in West Francia, which later became France. Most notable of them were: the eponymous count Robert the Strong (d. 866) and his sons, West Frankish kings Odo (888–898) and Robert I (922–923), whose son – duke Hugh the Great was father to the first Capetian king Hugh Capet (987–996).

Robert I (c. 866 – 15 June 923) was the elected King of West Francia from 922 to 923. Before his election to the throne he was Count of Poitiers, Count of Paris and Marquis of Neustria and Orléans. He succeeded the overthrown Carolingian king Charles the Simple, who in 898 had succeeded Robert's brother, king Odo.