Kyzikos in Mysia, 150-250 AD., pseudo-autonomous issue, Æ18, Von Fritze 38.

Kyzikos in Mysia, pseudo-autonomous issue, 100-200 AD.,
Æ18 (18 mm / 2,47 g),
Obv.: draped bust of Kore Soteira right, wearing taenia (no necklace?); all within wreath.
Rev.: KYZIKH / NΩN , Triton right, holding rudder and (tunny?) fish.
Von Fritze KK III 26, 38 var. (no necklace) ; SNG France 602 var. (same) .
Rare

Persephone had been Kore Soteira (= Saviour) at Cyzucus.
Like Eleusis in Central Greece, Cyzicus was also an important center for the worship of Persephone. Among the most ancient of the deities in the Olympian pantheon and with connections to a pre-Hellenic mother earth goddess, she was, in her incarnation as Kore, the unmarried maiden, closely associated with Demeter, or Deo, the woman as matron and mother. Later adapted to create the mother-daughter pair and incorporated into traditional Classical mythology, Demeter remained connected with fertility, particularly that of the earth, while Persephone became the queen of the Underworld and whose part in the Eleusinian Mysteries offered the hope of life after death.
In the Orphic version of the story, which seems to be the source for our coin type, Persephone's abductor as Zeus, who spirited her away disguised as a serpent. From this union was born Dionysus-Zagreus. At the instigation of Hera, the Titans tore the child, disguised as a bullock, to pieces and proceeded to consume the flesh. Driving them off, Zeus recovered the still-beating heart, which he either incorporated into himself, or fed to Semele. These latter elements linked Zagreus with Dionysus, since both were connected to regeneration and had mysteries in their own right. Sophocles (Fr. 94), called Dionysus "Iacchos with the horns" and according to Athenaeus (Deipnosophistae 2) a statue of Dionysus in the form of a bull stood in Cyzicus, perhaps on the grounds of the temple complex.

Triton is a mythological Greek god, the messenger of the deep. He is the son of Poseidon, god of the sea, and Amphitrite, goddess of the sea. He is usually represented as a merman, having the upper body of a human and the tail of a fish.
Like his father, he carried a trident. However, Triton's special attribute was a twisted conch shell, on which he blew like a trumpet to calm or raise the waves. Its sound was so terrible, that when loudly blown, it put the giants to flight, who imagined it to be the roar of a mighty wild beast (Hyginus, Poet. astronom. ii. 23).
According to Hesiod's Theogony, Triton dwelt with his parents in a golden palace in the depths of the sea. The story of the Argonauts places his home on the coast of Libya. When the Argo was driven ashore on the Lesser Syrtes, the crew carried the vessel to Lake Tritonis, whence Triton, the local deity, guided them across to the Mediterranean (Apollonius Rhodius iv. 1552).
Triton was the father of Pallas and foster parent to the goddess Athena. Pallas was killed by Athena during a fight between the two goddesses.[1]. Triton is also sometimes cited as the father of Scylla by Lamia. Triton might be multiplied into a host of Tritones, daimones of the sea.
Triton also appeared in Roman myths and epics. In the Aeneid, Misenus, the trumpeter of Aeneas, challenged Triton to a contest of trumpeting. The god flung him into the sea for his arrogance.