Matilda married Henry the Lion, then Duke of Saxony and Bavaria, on 1 February 1168 at Minden Cathedral in Saxony. The Welf duke had divorced from his first wife, Clementia of Zähringen, in 1162. He and Matilda had four sons and one daughter:
Three other children are listed, by some sources, as having belonged to Henry and Matilda:
Eleanor ; died young
Ingibiorg ; died young
Son
Regency and exile
At the time of their marriage, Duke Henry the Lion was one of the most powerful allies of the Hohenstaufen emperor, and his royal consort added to his dominant position. Matilda governed her husband's vast estates during his pilgrimage to the Holy Land from 1172 to 1173. Back in Germany, Henry built up his residence in Brunswick, where he and Matilda held a magnificent court at Dankwarderode Castle. They had Brunswick Cathedral erected from 1173 onwards and initiated the Lucidarius, the first original German language work in prose, as well as the Gospels of Henry the Lion, a masterpiece of Romanesque book illumination. Soon after, however, Henry the Lion became involved in a fierce conflict with Emperor Frederick. Allegedly, both men fell out with each other, when they met in Chiavenna in 1176, and Henry refused to support the emperor in his fight against the Italian Lombard League. Frederick's forces were defeated in the Battle of Legnano and the emperor had to make peace with the hostile Pope Alexander III. A number of rivaling princes intrigued against Henry and the duke was finally declared deposed in 1180. Henry submitted to the emperor in November 1181; nevertheless, he and his family were forced to flee Germany and take refuge in Normandy at the court of Matilda's father in 1182. During this time at the royal court at Argentan, Matilda became acquainted with the troubadour Bertran de Born, who, calling her "Elena" or "Lana", made her the object of his desire in two of his poems of "courtly love". Matilda, her husband, and their family remained under the protection and financial support of King Henry II until 1185, when, by the mediation of the English monarch, they were allowed to return to Saxony. Any hopes to regain the Saxon and Bavarian duchies were disappointed. Early in 1189, the emperor gave Henry the Lion a choice to accompany him on the Third Crusade or go into exile. Henry returned to England, while this time Matilda remained at Brunswick to defend the interests of her husband. However, she died three months later at the age of 33, 8 days before her father. After her death, her husband again entered Germany and finally reconciled with Emperor Frederick's son Henry VI. In 1194, his first-born sonHenry the Elder was enfeoffed with the County Palatine of the Rhine.