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Regnal number
Have never seen him described as John II before, only John the Elder. Is there a reference for the use of a regnal number here? Otherwise perhaps the article should be moved to John the Elder, Duke of Schleswig-Holstein-Haderslev or simply John, Duke of Schleswig-Holstein-Haderslev.Trip Tucker (talk) 04:05, 27 December 2011 (UTC)[reply]
