The Earldom of Orkney, the Duchy of Schleswig and the Kalmar Union in 1434

ABSTRACT In August 1434, Erik VII, king of Denmark, Norway and Sweden, confirmed William Sinclair as earl of Orkney, thus ending a decade-long dispute over the hereditary nature of that island fief. Although surviving sources pertaining to Orkney tell us little about Erik VII’s motives, historians have traditionally pointed to circumstances in and around the isles to explain the king’s acknowledgement of William’s claims. In this article, it is argued that the events must be interpreted in light of a concurrent dispute over counts of Holstein’s hereditary claims to the duchy of Schleswig, which were vigorously denied by Erik VII. It can be concluded that the latter dispute influenced the debate over Orkney by making the hereditary enfeoffment of William Sinclair a strategic impossibility for Erik VII, who could not acknowledge one claim without opening the door for another. The king’s acquiescence of William’s claim in 1434, we contend, reflected changing conditions in Schleswig, where the king was forced to recognize the counts’ hereditary rights. The contribution offers a new take on Orkney’s late-medieval development and encourages that island principality’s inclusion in pan-Scandinavian events.