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A secondary key is the unique identifier for a table.
Antoninus Pius
A Roman Emperor from 138 to 161 AD, known for his peaceful reign and the prosperity of the Roman Empire during his time.
Emperor
The sovereign ruler of an empire, commanding great authority and power.
Tivoli
A town in Italy, known for its historical sites, including the Roman ruins of Villa Adriana and the Renaissance architectural complex Villa d'Este.
Hadrian
Roman Emperor from 117 to 138 A.D., known for constructing Hadrian's Wall which marked the northern limit of Britannia.
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