Bertrade of Montfort (c. 1070 – 1127) was a French noblewoman of the House of Montfort who became queen consort of France through her marriage to King Philip I. She was the daughter of Simon I, lord of Montfort‑l’Amaury, and Agnès d’Alton.
Bertrade first married Robert II, Count of Flanders, around 1085. In 1092 she left Robert and entered into a marital relationship with Philip I of France, a union that was considered bigamous and caused significant controversy within the French realm and the Church. Despite the scandal, Philip I recognized Bertrade as his queen, and she was coronated as queen consort of France.
Following Philip I’s death in 1108, Bertrade married Fulk V, Count of Anjou, who later became King of Jerusalem. Through this marriage she acquired the title Countess of Anjou. She bore several children, including:
- Philip, who died in childhood;
- Fulk VI, Count of Anjou;
- Agnes, who married Ralph I, Count of Vermandois;
- Possibly others, though records are not unanimous.
Bertrade’s life intersected with major political and ecclesiastical disputes of the early 12th century, particularly concerning the legitimacy of her marriage to Philip I and the subsequent papal condemnation of their union. She remained an influential figure in French and Angevin politics until her death, which is variously recorded as occurring in 1127 (most commonly accepted) or, in some sources, 1117.
