The Elder Scrolls V: Skyrim Song?

This is the song.

For the king,

For the king,

For the sake of Skyrim,

For our lives,

For our home,

For Hrothgar's blood,

For the Nords and the gods,

For the sole single son,

Dovahkiin, our king, who'll dawn in fire!

Now my curiosity lies in this one line:

For Hrothgar's blood,

Why is the Dwarf king of the Inheritance series in this song?

There are only two long shot connections:

Dragons and Fantasy

So what do you think? Just a little easter egg? Or something more?

If you have any idea's i would love to hear them.