Bertha Welf de Bourgogne was born 967 to Conrad III de Bourgogne (c925-993) and Mathilde (943-c981) and died 1016 of unspecified causes. She married Odo de Blois (950-996) 983 JL . She married Robert II of France (972-1031) 996 JL . Alfred the Great (849-899)/s, Charlemagne (747-814)/s.
According to Italian Wikipedia, Bertha married a third time to Arduin of Ivrea (955-1015), and had seven more children.