Prias
From NsdWiki
Prias was one of the first to lead his human followers to Gaeis through a portal. He was proclaimed the first human King and settled in the area which is now Cadwal. He laid out the plans for the first Wall around his country, but ironically enough, fell to a Sidhe raid before he could see it completed. During his reign, he sent emissaries to all corners of Gaeis and gave his blessing for his people to expand and explore. He is referred to as the father of the 13 nations.