The name Caesar transitioned from a Roman family name into a universal monarchical title

Evidence

Legally speaking, Claudius had no right to be called ‘Caesar’, but the word was making a transition from a family name to a title that reaches into the modern era as ‘Kaiser’, ‘Tsar’ and possibly ‘Shah’. — Stephen Kershaw, A Brief History of the Roman Empire, 530

Categorization

• corroborated: 2 independent passages support this claim — Stephen Kershaw, A Brief History of the Roman Empire, 530
• XREF: connects to: Naming conventions of rulers encode the shift from monarchy to citizen-republic — Benedict Anderson, Imagined Communities: Reflections on…, 130