Thorfinn Sigurdsson aka
Thorfinn the Mighty, Earl of Orkney (c 1009 - 1065)
One viking era pirate was the grandson of Malcolm, King of Scots. Earl Thorfinn began his raids at the age of fifteen, and became noted for his courage and tactical abilities. Tall, strong, and ugly, he craved fame. He often raided with his nephew, Rognvald.
Perhaps the most noted of the Orkney raiders was Svein Asleifarson. After his five ships raided the Hebrides, he headed for Dublin. Along the way he captured two merchant ships laden with broadcloth. Upon his return to Orkney, Svein made awnings from the broadcloth and stitched it to his sails to give the appearance that they were made of fine fabric. Doing so earned the raid the name "the broadcloth viking trip.'"
On his last raid, he left Orkney with seven longships. Finding little plunder in the Hebrides, Svein and his men plundered settlements along the coast of Ireland until they reached Dublin. They took the town before the people even knew the pirates were there. The Dubliners offered to pay Svein whatever he wanted, but only the next day. During the night, they dug deep pits in strategic places, then camouflaged them with branches and straw. In the morning, when Svein and his men came to collect, the Dubliners positioned themselves so that the Norse fell into the pits where they were slain.
https://en.wikipedia.org/wiki/Thorfinn_the_Mighty http://www.orkneyjar.com/history/historicalfigures/thorfinn/index.html