Granmar was a king of Södermanland, in Snorri Sturluson's Heimskringla. The same king also appears in the Volsunga saga.
Granmar was married to Hilda, the daughter of the Geatish king Högne of East Götaland, and his son-in-law was the seaking Hjörvard of the Ylfings. These three kings defended themselves against the Swedish king Ingjald Ill-ruler.
According to the Heimskringla, he had no sons, but the legends of Helgi Hundingsbane relate that he had the sons Hothbrodd, Gudmund and Starkad who were slain by Helgi. (Possibly the legend of Helgi originally referred to a different King Granmar, as it seems to be set in the fifth century and Ingjald and the rest are clearly seventh-century.)
Snorri relates that when the Swedish king Ingjald ill-ruler invited seven petty kings in order to burn them all to death inside his hall, Granmar did not arrive and so he escaped being murdered.
The same summer, the Sea-king Hjörvard of the Ylfings arrived at Myrkva Fjord (Mörköfjärden, an inlet that is still used to pass between Mälaren and the Baltic Sea and divides Södermanland in two parts). Hjörvard was invited to a feast with Granmar and he agreed as he had never pillaged in the area before. He was gladly welcomed and the kings sat with one woman each as was the custom, while the others formed a single group. Hjörvard's Vikings did not like that as it was their law that everyone at a feast should drink together. Hjörvard then sat in a high seat opposing Granmar and his men sat on the same bench as him.
Revelations
I saw heaven standing open and the rider called faithull and true...
With my profund justice
I judge and I make war
My eyes are like blazing fire
And on my head are many crowns
On my body a name is written
But no one knows it but me
I am dressed in a rope dipped in blood
My name will be the slaughter of God
The armies of heaven will fall and then follow me
Dressed in white but covered by blood
Out of my mouth will come a sharp sword
To strike down nations rule them by my evil hand
Fallen angels lay slaughtered around me
In pools of blood
As time goes by and the Christian souls they die
We shall see the world with new eyes
Through the kingdom of God we shall ride
Angels and true belivers Christ we will strike
For I am the newborn King of kings and
I am the Lord of Lords
I saw an angel standing all alone in the blood
Who cried out loud
Come gather for the great supper of God
So that you may eat the flesh of kings and generals
And mighty men
And all the flesh of the people, free and slave
And small and great
I saw God almighty gathering his remaining kings of the earth
Gathering their armies to fight the new self pronounced
King of kings...
But the lone rider he prevailed and a new prophet was born
His name not known to man but he calls himself
Lord of the lords...
With these signs he deluded the mind of those
Who recieved the mark of the beast and worshipped his image
But the lone rider prevailed and a new prophet was born
His name not known to man but he calls himself