Frostating and Norway's three other ancient regional assemblies, the Borgarting, Eidsivating, and Gulating, were joined into a single jurisdiction during the late 13th century, when King Magnus the Lawmender had the existing body of law put into writing.
These were representative assemblies at which delegates from the various districts in each region met to award legal judgments and pass laws.
When Norway was united as a kingdom, the four independent lagting – Frostating, Gulating, Eidsivating, and Borgarting – were the most supreme bodies of law, acting as both legislative assemblies and courts.
[4] A unified code of laws for a whole country had until then only been introduced in the Kingdom of Sicily in the Liber Augustalis promulgated in 1231 by Frederick II, Holy Roman Emperor and the Fuero Real compiled during the reign of Alfonso X of Castile.
The king sits in the middle on his throne with a crown on his head and a scepter in his hand, and with the Norwegian lion under his foot.
The original of the Frostating seal is in the Diplomatarium Norvegicum, a source collection of Norwegian letters and documents from earliest recorded history until 1570.