The younger twin brother of Alexiel. He was imprisoned in the Earth after the War. “Formerly a scion (descendant of a noble family) of Dominiones.”
Regarding Rosiel’s nobility: Kaori Yuki is using the “Pseudo-Dionysius” celestial hierarchy. Therefore the Dominiones are the 4th rank. Dionysius – “ They regulate angels’ duties and are perpetually aspiring to true lordship; through them the majesty of God is manifested” “Emblems of authority: scepters, orbs” (A Dictionary of Angels, Davidson.)