See The Breaking
The Godholme at Skali summons the Jarls to form the Great Pact. The Pacts purpose is to protect all the Jarl lands from far south Fire Giant incursions. Each Jarl agrees to supply warriors to fight should the Godsholme require it. It is the first pact of its kind since the Breaking just over 600 years prior.
Jarl Frode leads men to defeat a Kobold incursion and attacks against the nearby gnome village of Havenrock. Havenrock joins Jarl Frode's Jarldom as a result.
The Godsholme sends a call for aid of a Jarldom far to the south being attacked by a Fire Giant army. Holl sends it most heroic warriors to aid the defense of the Pact. Few return in the years that follow. Among those that never returned were the Yule Night heroes .
Birger Gangestad slays Jarl Erik Frode in ritual combat. The combat started as a difference of opinion, and escalated to heated words. Birger then challenged the Jarl. The combat was long, and both men were matched evenly, but Birger Gangestad eventually won and slew the old Jarl.