Isir the giant historical tale

In Eamont Bridge in Cumbria, by the river, is a cave known as Giant's Cave, a place associated with two giants called Tarquin and Isir. The pair lived on a diet of human flesh, a practice which might have lost its appeal when Sir Lancelot slew Tarquin in battle. A similar tale comes from another Cumbria cave system, the Isis Parlis system. This cave system was once the home to a giant named Hugh Cesario, who either fought on the side of good, or took local men, women and farm animals back to the cave to snack on.

Maybe these are both folklore legends derived from real Woodwose encounters.....