Festing Man
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
A bondsman; a surety; a pledge; a frank pledge. It was one privilege of monasteries that they should be free from festing men, which Cowell explains to mean not to be bound for any man's forthcoming who should transgress the law.
Cowell.