Lambert of Maastricht, commonly referred to as Saint Lambert (Latin: Lambertus; Middle Dutch: Sint-Lambrecht) (c. 636 – c. 705) was the bishop of Maastricht-Liège (Tongeren) from about 670 until his death. Lambert denounced Pepin's liaison with his mistress Alpaida, the mother of Charles Martel. The bishop was murdered during the political turmoil that developed when various families fought for influence as the Merovingian dynasty gave way to the Carolingians. He is considered a martyr for his defence of marriage. His feast day is September 17.