465 BCE King Xerxes I of the Persian Empire was murdered by his uncle, Artabanus the Hyrcanian. He was succeeded by Artaxerxes I, possibly with Artabanus acting as Regent.

I wonder if this was something to do with the following quotation from Herodotus, The Histories, 7.11:

"'Artabanus,' he replied, 'you are my father’s brother, and that alone saves you from paying the price your empty and ridiculous speech deserves. But your cowardice and lack of spirit shall not escape disgrace: I forbid you to accompany me on my march to Greece. You shall stay at home with the women, and everything I spoke of I shall accomplish without help from you. If I fail to punish the Athenians, let me be no child of Darius, the son of Hystaspes, the son of Arsames, the son of Ariaramnes, the son of Teispes, [and let me be no] son of [Atossa, the daughter of] Cyrus, the son of Cambyses, the son of Teispes, the son of Achaemenes!'"

That would get me angry.

X was King Xerxes, whom
Papa much wished to know;
But this he could not do, because
Xerxes died long ago.

Words and picture by Edward Lear, Nonsense Alphabet