He published more than 100 books , novels and biographies , among them those of Anton Chekhov , Catherine the Great , Rasputin , Ivan the Terrible and Leo Tolstoy . Troyat published more than 100 books , novels and biographies , among them those of Anton Chekhov , Catherine the Great , Rasputin , Fyodor Dostoyevsky , Ivan the Terrible and Leo Tolstoy .