Augustus
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The United Nations pinpoint the origin of Human Rights to the year 539 BC. When the troops of Cyrus the Great conquered Babylon, Cyrus freed the slaves, declared that all people had the right to choose their own religion, and established racial equality. These and other precepts were recorded on a baked-clay cylinder known as the Cyrus Cylinder, whose provisions served as inspiration for the first four Articles of the Universal Declaration of Human Rights
This is complete nonsense though.
The Cyrus Cylinder is basically a building dedication, an imperialist propaganda document justifying the rule of Cyrus over conquered peoples. It wasn't even particularly original propaganda. It has nothing to do with human rights and Cyrus was a typical empire builder of classical antiquity - and these empires were not built on human rights, "freeing slaves" or anachronisms like "racial equality", but violence and the threat of violence.
“Much of our knowledge of the fall of Babylon comes from the so-called Cyrus Cylinder – a clay foundation deposit written in Akkadian discovered near the sanctuary of Marduk in the city. It was presumably composed on Cyrus’ orders, although the whole document is written from a Babylonian point of view in traditional Babylonian terms. As a piece of imperial propaganda, the Cylinder attempts to legitimize Cyrus’ conquest of Babylon by representing the king as the champion of the god Marduk, who finds in Cyrus the city’s saviour. It seems that the Babylonians benefited from Cyrus’ capture of their city; certainly the Jews of Babylonia profited from his benevolence and were allowed to return to their homelands. Other peoples did not fare so well under Cyrus: the citizens of Opis were massacred en masse, and, following the fall of Lydia, the population was deported to Nippur in Babylonia, where a community of Lydians is later attested.”
L Llewlyn-Jones - The first Persian Empire
In the 60s, the Shah wanted to appropriate Cyrus to prop up his legitimacy, hence a myth was born.