Jase - Died from a snake bite.
Mathis - Died in a duel against Boran Viper.
Syrus - A name which a few peasants have tried to use to claim nobility.
Vahn - Gave up on trying to claim his father's name.
Sir Brandon Athins - The First of his house. He was knighted for his accomplishments as a captain. He chose the Phoenix on a checkered field of white, red, and black as his crest. He is said to have claimed ancestry to an ancient house and cited it as his reason for choosing the phoenix. He was indeed somehow related to the recently deceased house of Reiven.
Lady Arys Reiven - Brandon's third child and only daughter. Married to Mathis Reiven at a young age by her father to bond his newly formed house to one with which he claimed a relation. She bore only one child by him (Borin) before he disappeared while serving as a Lord of Eraus in Ikalak.
White Knights(Archers) - Always entrusted to the Heir of the Athins house. They first served Jase, and then Rev.
Red Knights(Archers) - Always entrusted to the eldest living female of the house who is commanding fighting men. It has only served Alise.
Black Knights(Archers) - Always entrusted to the second Heir of the Athins house. They first served Rev, then Bryce, and now serve Borin.
Flames of Sanctus Acies - Mathis' units, so named for his strong faith in Sanctus Acies.
Phoenix Guard - Newly created to protect Elys with the intent to always be entrusted to the second also female commanding troops.
Ideas on Unknown 1
Ideas on Unknown 2
Ideas on Unknown 3
Ideas on Unknown 4
No idea. Maybe Rev 100 day ruler, but he is at 129 and Niselur only has one region.