Achaemenid dynasty

The Achaemenid dynasty ( Haxāmanišyaʰ; Haxâmaneši;  Achaimenidai; ) was a royal house that ruled the Persian Empire, which eventually stretched from Egypt and Thrace in the west to Central Asia and the Indus Valley in the east.

Origins
The history of the Achaemenid dynasty is mainly known through Greek historians, such as Herodotus, Thucydides, and Xenophon. Additional sources include the Hebrew Bible, other Jewish religious texts, and native Iranian sources. According to Herodotus, the Achaemenids were a clan of the Pasargadae tribe:"These were the leading tribes, on which all the other Persians were dependent, namely the Pasargadae, Maraphians, and Maspioi. Of these, the Pasargadae are the most noble and include the family of Achaemenids, the Kings of Persia, who are descendants of Perseus."Darius the Great, in an effort to establish his legitimacy, later traced his genealogy to Achaemenes, Persian "Haxāmaniš". His son was given as Teispes, and from him came in turn Ariaramnes, Arsames, and Hystaspes. However, there is no historical evidence for any of these.

Dynasty
The Persian Empire was a hereditary monarchy, though the spirit of eldest son succession was often violated through palace intrigues. The historical kings as given in Greek sources are: