When did the incident between Queen Vashti and King Ahasuerus take place?

There is a compelling case from the Old Testament for QueensVashti and and Esther to have been the wives of King Astyages (Ahasuerus) son of King Cyaxares of the Medes who ruled the Median Empire from around 630 to 585 BCE. Astyages was probably born around 620 BCE.becoming the father of Darius the Mede in 601BCE. His first wife Vashti must have been the mother of Darius the Mede, who was 62 years old in 539 BCE when he took the Babylonian kingdom for his nephew General Cyrus of Anshan, a part of Persia.
Astyages' removal of Vashti occurred in 582 BCE and four years later her married the Jewess Esther, making her Queen of the Medes. Astyages was a Median king, not a Persian. He cannot be confused with the Persian King Xerxes, who was born around 519 BCE and cannot therefore have been the husband of Vashti and Esther.
The book Vashti Queen of the Ancient Medes is the first historical novel that frees these ancient Middle Eastern queens from the chains of historical distortions, ommissions and cover-ups designed by the dominant powers who followed to erase the true story of the Medes, their culture and the Airyanem Vaejah civilisation which was the first to grant the human rights enjoyed by so many today.
Ironically and most unjustly, their descendants the contemporary Kurds fight now in the land of Queen Vashti for the rights their ancestors enjoyed, particularly for women. The novel describes how Queen Vashti's struggle reflects ther uncompromising stand for freedom of conscience and choice.