Philip was King of France from 1129 to 1131, co-ruling with his father, Louis VI. As he predeceased his father and never reigned as sole king, he is not known by an ordinal or included in the traditional lists of French monarchs.

Louis VI, called the Fat or the Fighter, was King of the Franks from 1108 to 1137. Chronicles called him "King of Saint-Denis". Louis was the first member of the house of Capet to make a lasting contribution to centralizing the institutions of royal power. He spent almost all of his twenty-nine-year reign fighting either the "robber barons" who plagued Paris or the kings of England for their continental possession of Normandy. Nonetheless, Louis VI managed to reinforce his power considerably and became one of the first strong kings of France since the death of Charlemagne in 814.