Definition of "frankenpledge"

King John granted to the prior and convent, in all their manors and lands, sac, soc, tol, and theam, infangenthef, and outfangenthef, with the ordeals or judgment by fire, water, and iron, and a common gallows in each manor; with a view of frankenpledge, and assize of bread and ale, of all their tenants...

1806, Francis Bloomfield, An Essay Towards a Topographical History of the County of Norfolk, Vol. IV, p. 517