Which legendary danish King had a clan called Skjöldungs?
Hrólfr Kraki Hrólfr Kraki, "Hroðulf", "Rolfo", "Roluo", "Rolf Krage" (early 6th century) was a legendary Danish king who appears in both Anglo-Saxon and Scandinavian tradition. His name would in his own language (Proto-Norse) have been *"Hrōþiwulfaz" (famous wolf).
Great Heathen Army The Great Viking Army or Great Danish Army, known by the Anglo-Saxons as the Great Heathen Army (OE: "mycel hæþen here"), was a coalition of Norse warriors, originating from Denmark (and likely also from Sweden and Norway) who came together under a unified command to invade the four Anglo-Saxon kingdoms that constituted England in AD 865.