The Roman Necessitas is represented in the well-known ode of Horace (i.
Probably the most important were military service (fird, expeditio) and the repairing of fortifications and bridges - the trinoda necessitas of later times.
As attendance at the fyrd was included in the trinoda necessitas it was compulsory on all holders of land; but that it was not confined to them is shown by the following extract from the laws of Ine, king of the West Saxons, dated about 690, which prescribes the penalty for the serious offence of neglecting the fyrd: "If a gesithcund man owning land neglect the fyrd, let him pay 120 shillings, and forfeit his land; one not owning land 60 shillings; a ceorlish man 30 shillings as fyrdwite."
By a charter of 749 he freed ecclesiastical lands from all obligations except the trinoda necessitas.
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