The Borgsumburg on the North Frisian island Föhr.
The recording of April’s research seminar, featuring Dr Martin Segschneider on the Viking Age fortifications in Germany’s North Frisian Islands.
The two well-preserved, circular ramparts Borgsumburg and Tinnumburg were something of an enigma for decades as little was known about their structure, role and archaeological context.
But recent rescue excavations, aerial photography and geophysical survey have remedied the situation dramatically, leading to a research project focusing on Viking Age merchant sites in the vicinity of the fortifications and a second focusing on the ramparts themselves.
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