What if Michelangelo had not, as history concurs he had, declined the Sultan’s invitation to come to Constantinople in 1506 to design a bridge over the Golden Horn? This is the conceit behind Mathias Énard’s new novel, or rather novella, Tell Them of Battles, Kings, and Elephants (a perhaps anachronistic borrowing from the preface of a collection of Rudyard Kipling stories). What if Michelangelo had instead accepted?