Question: Danish Viking, who ruled over parts of Friesland between 841 and 873 was the uncle of a Viking leader who raided the British Isles, West Francia, Frisia, and Lotharingia in the 860s and 870?
{'answer': 'Roricus, Rorichus', 'supporting_facts': [['Rodulf Haraldsson', 1], ['Rorik of Dorestad', 0]]}