Kyzikos was famous numismatically for creating its electrum staters in the archaic era. These can be very pricy, so I don’t have one, though I do have this nice bronze coin.
According to mythology, Kyzikos was founded during the coming of the argonauts, though archeologists believe it more likely that it was settlers from Thessaly. Later, more settlers from Miletos joined them.
The famed philosopher Eudoxos of Knidos, who was a student of Plato, established a school in Kyzikos. He was responsible for much of the mathematics of concentric spheres, and was among the first to establish the trajectories of the planets. He also made other contributions to mathematics and is today honored by craters on the moon and Mars along with an algebraic curve.
The city swayed between Spartan and Athenian dominance until it came under the possession of the Persians. In 334 BCE, Alexander the Great liberated it and connected it to the mainland. Some time after his death, Kyzikos came under the dominion of the Attalids of Pergamon, where it remained until Roman times.
I’m uncertain whether this coin comes from Kyzikos. It bears resamblance to their types, though the ethnic is a poor match.
An Athenian fleet under Alkibiades, Thrasybulos, and Theramenes defeats the Spartans at the Battle of Kyzikos. Afterwards, Sparta offers peace but is rejected.
An earthquake destroys Kyzikos, including the newly built Temple to Hadrian. Funds for its rebuilding are allocated by Antoninus Pius.