Alice Perrers was quite the ambitious mistress, though we have to have some sympathy for her—she has been hated in her time and ever since.
Alice Perrers: The Manipulative Mistress

Alice Perrers was quite the ambitious mistress, though we have to have some sympathy for her—she has been hated in her time and ever since.
Joan of England is not a very famous princess. You probably only know her since she died of plague. If only she'd listened to the mayor of Bordeaux...
We know close to nothing about Helen of Bosnia. Most queens-regnant leave behind almost too much information for us, but Helen left us close to nothing.
Jeanne de Clisson was a noblewoman who ended up as a pirate after her husband's execution. The Lioness of Brittany always left one survivor to tell her tale, which they always did.
Joan I of Navarre was a regular queen. She became a country's first queen-regnant at the old age of one, then ran away to France with her mother, and made a happy political marriage.