The purpose of the legion was to join forces with Legio III Augusta in support of the rebellion of Galba (governor of Hispania Terraconensis) against Emperor Nero.
Nero eventually committed suicide and was replaced by Galba.
But the new emperor looked at Macer with mistrust, fearing another rebellion against himself.
Macer was killed in 69, the Year of the Four Emperors, and I Macriana liberatrix was disbanded.
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