"Each new Steward indeed took office with the oath ‘to hold rod and rule in the name of the king, until he shall return’. But these soon became words of ritual little heeded, for the Stewards exercised all the power of the kings. Yet many in Gondor still believed that a king would indeed return in some time to come; and some remembered the ancient line of the North, which it was rumoured still lived on in the shadows. But against such thoughts the Ruling Stewards hardened their hearts. Nonetheless the Stewards never sat on the ancient throne; and they wore no crown, and held no sceptre. They bore a white rod only as the token of their office; and their banner was white without charge; but the royal banner had been sable, upon which was displayed a white tree in blossom beneath seven stars."
January 1, 1970
https://en.wikiquote.org/wiki/Appendices_to_The_Lord_of_the_Rings