Marian reforms
Caesar's Civil War resulted from the long political subversion of the Roman Government's institutions, which began with the career of Tiberius Gracchus, continuing with the Marian reforms of the legions, the bloody dictatorship of Lucius Cornelius Sulla, and completed by the First Triumvirate over Rome. The political situation is discussed in depth in the ancient histories of Appian and Cassius Dio. It is also covered in the biographies of Plutarch. Julius Caesar's commentaries offer some political details but mainly narrate military manoeuvres of the civil war itself.