Trinoda necessitas

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Trinoda necessitas (Threefold Obligation)

In Anglo-Saxon England, trinoda necessitas was a term used to describe a three-part obligation that subjects might owe to the king. It meant performing three kinds of public service:
- bridge-bote: repairing bridges and roads
- burgh-bote: building and maintaining fortifications
- fyrd-bote: serving in the militia (the fyrd)

These duties were essential to running the kingdom, so rulers rarely exempted people from them. After the Norman Conquest, exemptions became more common.

Origin of the term: The phrase is rarely used in early records. It appears in a land grant near Pagham, Sussex, from King Cædwalla of Wessex to Saint Wilfred, where the Latin term trimoda (threefold) is used. The label trinoda necessitas was introduced by John Selden in 1610 and is considered a later naming of the concept.

Usage in grants: Instead of the phrase, many grants spell out the three obligations explicitly. For example, a grant by Æthelberht of Kent in 858 to a thegn listed military service, bridge repair, and fortification as the duties.

See also: History of English land law

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