In about 250 BCE, a Celtic tribe known as the Parisii first settled Paris
on the Île de la Cité. In 52 BCE, the Parisii settlement was conquered
by the Romans and their general, Julius Caesar.
The Romans named the city
Lutetia, from an earlier Greek name
Lukotokía, whose origin is unknown. But the renaming did not stick. So the city of lights is known today as Paris, the name of its first founders, from over 2,200 years ago.
The coin is a Parisii gold coin, by the way. It dates to the 200s BCE.