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The Collaborative International Dictionary
Friborg

Friborg \Fri"borg\, Friborgh \Fri"borgh\, n. [AS. fri[eth]borh, lit., peace pledge; fri[eth] peace + borh, borg, pledge, akin to E. borrow. The first part of the word was confused with free, the last part, with borough.] (Old Eng. Law) The pledge and tithing, afterwards called by the Normans frankpledge. See Frankpledge. [Written also friburgh and fribourg.]
--Burril.

Wiktionary
friborg

n. (context historical legal UK English) The pledge and tithing, afterwards called by the Normans (term: frankpledge).