From the website:
Rogna is a kingdom in the Elkyri Islands off the west coast of Ivinia, a region known for warring kingdoms, icy fjords, and bold mariners. Raiding and piracy are Rogna's largest sources of wealth. Ships and settlements along Ivinia's western seaboard live in terror of the Rognan "sea-wolves" that strike with impunity in their black-sailed ships, rape and pillage, then return to the foggy Elkyri Islands.
Kingdom of Rogna details the history, culture, politics, government, religion, economics, and military resources of this intriguing island kingdom.