THE QUEEN OF SHEBA may not have existed, according to archaeologist Ricardo Eichmann (son of Adolph Eichmann - and I'm not making that up). He can't find any evidence that there was such a person. No matter: ancient Judaism and early Islam produced a rich cycle of legends about the Queen. To read some of them, go to the Solomon chapter of Ginzberg's Legends of the Jews and scroll down until you get to "The Queen of Sheba."