Diodorus assumes that Ictis , Mictis and Corbulo are the same .
Diodorus appears to have read Timaeus , who must have read Pytheas , whom Polybius also read .
Assuming that Ictis , Mictis and Corbulo are the same , Diodorus appears to have read Timaeus , who must have read Pytheas , whom Polybius also read .