The arms of the Regensburg Schottenklöster, which date from at least the 14th century, combined the arms of the Holy Roman Emperor (from whom the abbey received protection) dimidiated with a symbol that may be linked with the crest of the O'Brien dynasty arms (an 11th-century O'Brien is listed as the "fundator" of the abbey).
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The Flag and its variations is currently used by many organizations in Ireland especially those that operate in an all Ireland context for example the Ireland rugby team, Ireland hockey team and the Irish Amateur Boxing Association.
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