The queen of Sheba was once one of the most powerful leaders in the world but there are few clues left anywhere about this woman who ruled a rich and powerful nation somewhere in Africa -- perhaps, as some archeologists maintain, in what is now southwest Nigeria. Now, in what may be the site of her last home and gravesite, a University of Toronto professor is trying to unearth the queen's story -- partially told in the Old Testament -- as well as honouring her in the form of a new Nigerian museum and interpretive centre. "Each year both Muslim...