St. Adelaide of Burgundy:

29th great-grandmother

Daughter of King Rupert II of Burgundy. Married Lothair, who eventually became king of Italy. Upon his death, she married Emperor Otto the Great. Upon his death, she was ill-treated by her son, but became empress and used her power to restore monasteries, evangelize, convert pagans, and support the poor. She eventually retired to a convent. 
Canonized 1097 by Pope Urban II.