Anglo-Saxon commoners were required to provide services that later writers called the “three-knotted obligation” or trinoda necessitas. For 10 points each:
[10m] The first “knot” of the obligation was to serve in this militia of freemen, whose members served in Anglo-Saxon armies alongside more experienced troops such as housecarls.
ANSWER: fyrd
[10e] The second “knot” was to construct and maintain burhs, or fortifications, which this king first systematically built in the late 9th century to protect Wessex from Viking invasion.
ANSWER: Alfred the Great
[10h] The third “knot” was to repair these things, many of which were built by a medieval brotherhood founded by Saint Bénézet (“bay-nay-ZEH”). Walter Gervase traveled across England to raise funds for one of these things called “Old Exe.”
ANSWER: bridges [accept roads and bridges; accept brycg-bote, Old Exe Bridge, or Bridge Building Brotherhood; prompt on roads]
<Will Alston, Other History>