Time Ring (Warlords of Utopia)

An old man (in reality a member of the Great Houses fleeing the War) carried a Time Ring inscribed with Greek-seeming letters and an ouroboros.

He used it to travel to Roma I, where he appeared in the busy Roman Forum. Marcus Americanius Scriptor used the "bracelet" to explore the Known Worlds, building the Empire of Empires and leading their war against the Greater German Reich. (PROSE: Warlords of Utopia)