Augustine of Hippo
Catena Aurea · Matthäusevangelium 17
And when they were come to Capernaum, they that received tribute money came to Peter, and said, Doth not your master pay tribute? He saith, Yes. And when he was come into the house, Jesus prevented him, saying, What thinkest thou, Simon? of whom do the kings of the earth take custom or tribute? of their own children, or of strangers? Peter saith unto him, Of strangers. Jesus saith unto him, Then are the children free. Notwithstanding, lest we should offend them, go thou to the sea, and cast an hook, and take up the fish that first cometh up; and when thou hast opened his mouth, thou shalt find a piece of money: that take, and give unto them for me and thee.
(Quæst. Ev. i. 23.) For, saith He, in every kingdom the children are free, that is, not under tax. Much more therefore should they be free in any earthly kingdom, who are children of that very kingdom under which are all the kingdoms of the earth.