In Geoffrey of Monmouth 's Historia Regum Britanniae , she is described as one of the great beauties of Britain , descended from a noble Roman family .
In Geoffrey of Monmouth 's Historia Regum Britanniae , she is educated under Cador , Duke of Cornwall .
In Geoffrey of Monmouth 's Historia Regum Britanniae , she is described as one of the great beauties of Britain , descended from a noble Roman family and educated under Cador , Duke of Cornwall .