The Emperor is a symbol of strength. Its connection with Aries provides the inspiration for the blossoms of Spring. This also requires much battle, (
This is another rare instance in the Rider Waite deck where the attribution is publicly divulged, with the Rams adorning his Throne.
Note in the Thoth Deck version, the flag held by the lamb. It is based on the proto-Hebrew version of the letter Tzaddi.
The Mantegna Deck has two cards that seem to correspond to the Emperor card, the King, Imperator and Jupiter cards, (Kaplan, 39).