Also known as: "Hardrada", "Haraldr harðráði", "Hårdråde", "The Severe", "Haraldr Sigurðsson", "The Severe King", "stern counsel", "hard ruler", "Harald Sigurdsson Hardråde", "kong Harald Hardråde."
Cause of death: Fell in battle at Stamford Bridge, Yorkshire, England.
From “The Challenge for the Throne” website: http://anabelhelen.weebly.com/harald-hardrada.html Harald III Sigurdsson was the half-brother of Olaf II, who was also the king of Norway. Harald was with Olaf II when Olaf II was killed at the Battle of Stiklestad in the year of 1030. Harald sought refuge in Kiev and was protected by its ruler, Prince Yaroslav the Wise. In 1045 Harald went back to Norway and two years later became king after the death of his nephew, Magnus Olafsson. After some years Harald III became known as Hardrada which means "Hard Ruler". Over the next few years after that he was involved in a long drawn-out war against King Sweyn of Denmark but fortunately the two men signed a peace agreement in 1064.
When Edward the Confessor died in 1066, Harald claimed that his father and descendants had been promised the English throne by King Hardicanute, who was the one that ruled England between 1040 and 1042.
In 1066 Tostig, who was the brother of Harold of Wessex, went to Norway so he could meet Harald. The two men agreed to invade England and in early September around 300 ships sailed along the coast and did some plundering, including the burning of Scarborough. They then entered the Humber and on 20th September defeated Morcar's army at Gate Fulford. Four days later the invaders took York.
When Harold was told by a messenger that Hardrada of Norway had invaded with the intentions of conquering all of England, it is said that the king replied: "I will give him just six feet of English soil; or, since they say he is a tall man, I will give him seven feet!"
On 25th September Harold's army arrived in Yorkshire. He took Tostig and Hardrada by surprise at a place called Stamford Bridge. It was a hot day and the Norwegians had taken off their byrnies (a mail shirt that reaches the mid thigh). Harold and his English troops devastated the Norwegians. Both Hardrada [Harald III ] and Tostig were killed. The Norwegian losses were considerable. Of the 300 ships that arrived, less than 25 returned to Norway.