Sac

Jurisdiction in matters of dispute.

Scutage

A tax which allowed the holder of a knight’s fee to pay money in lieu of the military service due to the Crown.

Seisin

Possession of land as freehold.

Sententia

Sentence (judicial).

Soc

Jurisdiction; a liberty, privilege, or franchise granted by the king to a subject; also the area within which that franchise is exercised.

Surety

A person, fine or land acting as a guarantee for another person’s behaviour or undertaking.