Roman emperors dated their reigns from acquiring tribunician power

Evidence

From now on, Rome’s Emperors would count their reigns from the year when they acquired tribunicia potestas. — Stephen Kershaw, A Brief History of the Roman Empire, 267

Categorization

• corroborated: 2 independent passages support this claim — Stephen Kershaw, A Brief History of the Roman Empire, 267
• XREF: connects to: The Roman Senate’s permanence outmatched short-term officials’ legal power