What is "cartimandua"

Cartimandua or Cartismandua (reigned ) was a 1st-century queen of the Brigantes, a Celtic people living in what is now northern England. She came to power around the time of the Roman conquest of Britain, and formed a large tribal agglomeration that became loyal to Rome. Our only knowledge of her is through the Roman historian Tacitus, though she appears to have been widely influential in early Roman Britain.

Her name may be a compound of the Common Celtic roots *carti- "chase, expel, send" and *mandu- "pony".