Q) Did Daniel serve under Cyrus?
Daniel (biblical figure):  A noble Jewish youth of Jerusalem, he is taken into captivity by Nebuchadnezzar of Babylon and serves the king and his successors with loyalty and ability until the time of the Persian conqueror Cyrus, all the while remaining true to the God of Israel. Cyrus the Great: Cyrus II of Persia (Old Persian: 𐎤𐎢𐎽𐎢𐏁 "Kūruš"; <a href="New%20Persian">New Persian</a>: کوروش "Kuruš"; <a href="Hebrew">Hebrew</a>: כֹּרֶשׁ "Koresh"; <a href="Circa">c.</a> 600 – 530 BC), commonly known as Cyrus the Great  and also called Cyrus the Elder by the Greeks, was the founder of the <a href="Achaemenid%20Empire">Achaemenid Empire</a>.
serves the king and his successors with loyalty and ability until the time of the Persian conqueror Cyrus