Black's Law Dictionary (2nd edition)dictionaries

Festing-Man

In old English law. A frank-pledge, or one who was surety for the good behavior of another. Monasteries enjoyed the privilege of belng “free from festlng-men,” whlch means that they wer» “not bound for any man’s forthcoming who should transgress the law.” Cowell. See Fbank-Pledqe

Source: Black’s Law Dictionary 2nd Ed (1910)