@Jaredan What role does Garen have in Demacia?

So after reading Taric's lore, I have to wonder what exactly is Garen? In Jarvan's lore it says he leads an elite unit. In Taric's lore, he is the one who chose Taric's punishment. Why is that? What rank does Garen hold exactly?

I know he's the "Might of Demacian" , but he must hold some sort of traditional army rank too, right?