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In page Scottish clan:

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During the Wars of Scottish Independence, feudal tenures were introduced by Robert the Bruce that harnessed and controlled the prowess of clans by the award of charters for land in order to gain support in the national cause against the English.[1] For example, the Clan MacDonald were elevated above the Clan MacDougall, two clans who shared a common descent from a great Norse-Gaelic warlord named Somerled of the 12th century.[1] Clanship was thus not only a strong tie of local kinship but also of feudalism to the Scottish Crown. It is this feudal component, reinforced by Scots law, that separates Scottish clanship from the tribalism that is found in aboriginal groups in Australasia, Africa and the Americas.[1]