Chronicon Lethrense and Annales Lundenses
The even earlier source Chronicle of the Kings of Leijre (and the included Annals of Lund) tells that the Danish king Rorik Slengeborre put Orwendel and Feng as his rulers in Jutland, and gave his daughter to Orwendel as a reward for his good services. Orwendel and the daughter had a son, Amblothæ the Jutlander. The jealous Feng killed Orwendel and took his wife. Amblothæ understood that his life was in danger and tried to survive by playing insane. Feng sent Amblothæ to the king of Britain with two servants carrying a message that the British king should kill Amblothæ. While the servants slept, Amblothæ carved off the (probably runic) message and wrote that the servants should be killed and himself married to the king's daughter. The British king did what the message said. Exactly one year later, Feng drank to Amblothæ's memory, but Amblothæ appeared and killed him. He then burnt Feng's men to death in a tent and became the ruler of Jutland. Then he went back to Britain to kill the British king who wanted to avenge Feng's death, and married the queen of Scotland. Amblothæ went back to Jutland and was killed in battle upon arrival.
Read more about this topic: Hamlet (legend)