Begga [SEP] sister
The daughter of Pepin of Landen and his wife, Itta, Begga was the older sister of St Gertrude of Nivelles. She married Ansegisel, son of Arnulf, Bishop of Metz, and had three children: Pepin of Heristal, Martin of Laon, and Clotilda of Heristal, who married Theuderic III of the Franks. Ansegisel was killed sometime before 679, slain in a feud by his enemy Gundewin. Begga made a pilgrimage to Rome, and upon her return built seven churches at Andenne on the Meuse.
Veneration
Martin of Laon
Martin was the count of Laon in the late 7th century.
Family.
Also known as Martin of Herstal, he was the son of Ansegisel, and grandson of Arnulf of Metz. Martin's mother was Begga, daughter of Pepin of Landen. Their marriage united the two houses of the Pippinids and the Arnulfings which created what would later be called the Carolingian dynasty. 
He was brother to Pepin of Herstal, and through his sister, Clotilda, brother-in-law of Theuderic III