Aspects of this topic are discussed in the following places at Britannica.
...1165–1214), subdued much of the north and established royal castles there. After his capture on a raid into England, he was forced to become feudally subject to the English king by the Treaty of Falaise (1174); he was able, however, to buy back his kingdom’s independence by the Quitclaim of Canterbury (1189), though it should be emphasized that this document disposed of the Treaty...
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