For several centuries a controversy has been carried on concerning the manner of the saint’s death. According to tradition, Lambert became a martyr to his defense of marital fidelity. The Bollandists, Mabillon, Valois, Lecointe, Pagi and others held, however, that the saint was killed by Frankish nobles in revenge for the failure of a plundering expedition. Kurth in 1876 critically examined the centuries-old tradition and, documents in hand, proved beyond further doubt that Lambert was martyred because of his defense of the marriage tie. Pepin of Heristal lived for many years in irreproachable wedlock with the pious Plectrude, who bore him two sons. Later he entered into unlawful relations with Alpais, who became the mother of Charles Martel. When no one had the courage to remonstrate with Pepin, Lambert went to his court like another John the Baptist. Alpais, fearing that Pepin might heed the admonitions of the saint, appealed to her brother Dodo. The latter sought revenge and caused Lambert to be assassinated in the chapel of Sts. Cosmas and Damian, built by St. Monulphus, at Liege. His heart was pierced by a javelin while he was at the altar. The servants of the martyr placed his remains in a vessel, descended the Meuse to Maestricht, and buried them in the cemetery of St. Peter, in the vault of his parents, Aper and Herisplindis, beneath the walls of Maestricht. Between 714 and 723, St. Hubert exhumed the remains and had them translated to Liege, whither he had transferred, presumably as early as 723, his episcopal see. The saint’s feast is celebrated on September 17 A large number of churches have St. Lambert as their patron.
From the Original Catholic Encyclopedia (1907)