Answer
The Old Norse name of Sweyn Forkbeard is Sveinn Haraldsson tjúguskegg. This name translates to "Sweyn, son of Harald, with the forked beard." Sweyn Forkbeard was a renowned Danish Viking king who ruled in the late 10th and early 11th centuries. His reign marked a significant period in Danish history, characterized by successful military campaigns and the spread of Christianity in Scandinavia.