Frankpledge
Frankpledge , noun
[Frank free + pledge.]
(a)
(O. Eng. Law) A pledge or surety for the good behavior of freemen, -- each freeman who was a member of an ancient decennary, tithing, or friborg, in England, being a pledge for the good conduct of the others, for the preservation of the public peace; a free surety.
(b)
(O. Eng. Law) The tithing itself. — Bouvier
The servants of the crown were not, as now, bound in frankpledge for each other.