8. In the same work, addressing Callistio, the same writer acknowledges that he had been instructed at Rome by Tatian. And he says that a book of Problems had been prepared by Tatian, in which he promised to explain the obscure and hidden parts of the divine Scriptures. Rhodo himself promises to give in a work of his own solutions of Tatian’s problems. There is also extant a Commentary of his on the Hexæmeron.