Petronilla of Lorraine

In 1121, after her husband's early death, she became regent for their son, Dirk VI.

After Baldwin VII, Count of Flanders died without heirs, she supported her son's claim to become Count of Flanders during the Flemish succession war of 1127, but Baldwin was eventually succeeded by Charles I.

[3] In the struggle for power between Dirk and his younger brother, Floris the Black in 1129–31, she supported the latter upon his first attempt.

Petronilla founded Rijnsburg Abbey in 1133, where it seems that she retired from court and politics and spent the rest of her life.

She was abbess when her cousin sold the abbey and Ada was obliged to use her own money to repurchase it.