...when I came across this; ASOIAF = A Song Of Ice And Fire.

Holdings of Jarl Gjalund

Survey of the Holdings of Jarl Gjalund

As Witnessed by Slafknir the Scribe, so Sworn by the Old Gods and the New

It looks to me that it might be an Easter Egg of sorts.

To make this a more lore orientated topic, who do you think the 'Old Gods' are? The Ancient Nordic pantheon? Or even earlier? This text does date back to 'just after the Dragon War' according to Farengar so are the Nine Divines active in Skyrim already (which are the new gods in ASOIAF)?