In the establishing of Vespasian on the imperial throne an important part was played by Ti. Iulius Alexander, the prefect of Egypt. Before any decisive step was taken by Vespasian, the Egyptian prefect had deliberated with either Mucianus or Vespasian, or with both, and had pledged his support. The prefect was, moreover, the first to have his soldiers take the oath of allegiance to Vespasian, on July 1st, 69. The die was cast by Vespasian at the conclusion of a conference held with Mucianus at Mt. Carmel, and it is only reasonable to suppose that Ti. Iulius Alexander had a representative at this all-important meeting. I suggest that there was such a representative, a certain Basilides, concerning whom we have considerable information.