A serpent
- with seven heads – seven dynasties
the dynasties of the roman empire
– Julio-Claudian dynasty 68
– Flavian dynasty 96
– Nerva–Antonine dynasty 192
– Severan dynasty 235
– Constantinian dynasty 361
– Valentinian Dynasty 455
– House of Leo 476
apocalypse 
That’s interesting. I hadn’t really reached a definite conclusion about this verse. There were also 7 kingdoms that ruled the city over her long history
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