Although the emergence of the nation into political consciousness is often placed in the nineteenth century, attempts by political leaders to craft new national identities, with their dynasty at the center, have been identified as early as the late Roman Empire. The Barbarian rulers of the successor states crafted these new identities on the basis of descent of the ruler from ancient noble families, a shared descent of a single people with common language, custom, and religious identity, and a definition in law of the rights and responsibilities of members of the new nation.