Agnus Dei, Not vocative? Hello all. I’m relatively new in my latin skills so excuse me for any errors. I was reading the chant Agnus Dei. When translating, it seems that it is addressing the lamb, and describing his actions. It says he “takes away the sin of the world” (Tollis peccata mundi). Shouldn’t it be “Agne Dei,” if it’s a chant addressed to the Lamb? Why is it -us?

Thanks!