Have taken Eadgils' life away.
The son of kings of Frey's great race,
First in the fray, the fight, the chase,
Fell from his steed – his clotted brains
Lie mixed with mire on Upsal's plains.
(Swedish king from the 6th century)
...Odd was the son of Grim Lodinkinni of Hålogaland. When he was an infant, it was predicted that he would be killed by his own horse Faxi, at the place he was born at the age of 300 years. In order to undo the prophecy, he killed his horse, buried it deep in the ground and left his home intending never to return again. Örvar-Oddr travelled in the South fighting against the corsairs of the Mediterranean, had himself baptized, was shipwrecked and arrived alone in the Holy Land. Dressed as an old man, he arrived in Hunaland where his true identity was soon revealed due to his heroic actions. After having defeated the king of Bjalkaland, he married the princess Silkisif and became the next king. After all this, he became homesick and went back home. Walking over the grave of Faxi, he mocked the old prophecy, but tripped over the skull of a horse from which a snake appeared. The snake bit him and he died. http://en.wikipedia.org/wiki/Orvar-Odd
...In the Primary Chronicle, the pagan priests prophesized that Prince Oleg (Helgi) of Novgorod would take death from his stallion. Proud of his own foretelling abilities, he sent the horse away. Many years later he asked where his horse was, and was told it had died. He asked to see the remains and was taken to the place where the bones lay. When he touched the horse's skull with his boot a snake slithered from the skull and bit him. Oleg died, thus fulfilling the prophecy. http://en.wikipedia.org/wiki/Oleg_of_Novgorod#Legend_of_the_death_of_Oleg_the_Prophet
...In later life William the Conqueror became very fat. In 1087 William was told that King Philip of France described him as looking like a pregnant woman. William got furious and mounted an attack on the king's territory. On 15th August he captured Mantes and set fire to the town. While fighting the French at the Battle of Mantes, he was thrown against the pommel of his saddle so violently that his intestines burst. Or, more diplomatically: "while the town burned he suffered some injury from which he never recovered".