Timeline for Greek and Roman Democracy By Conrad Ning 451 The 12 tables B.C 507 Roman Republic 527 Justinian Code A.D Mar 2, 2022 Solon's Reform BC Mar 2, 2022 Cleisthenes B.C Mar 2, 2022 Beginning of Republic Period: Mar 2, 2022 to 461 Pericles Reform B.C