 Complete the following phrase:  During June of AD 68 through December of AD 69, Galba, Otho, and Vitellius successively rose and fell from power. Finally, in July AD 69, the accession of Vespasian to the throne marked the start of the Flavian dynasty. The social, military and political upheavals of the period had Empire-wide repercussions, which included the outbreak of the 