Apart from Tium, Latinized forms of the name are Teium,Tieium and Tius, corresponding to the Greek names (Teion), (Tieion), ? (Tion) and ? (Tios).
The town was founded as a colony from the Greek city of Miletus in the 7th century BCE. According to Strabo, the town was only remarkable as the birthplace of Philetaerus, founder of the royal dynasty of Pergamon. At the beginning of the 3rd century BCE, Amastrine (Amastris), the niece of the last Persian king Darius III, who was the wife of Dionysius, tyrant of Heracleia, and after his death the wife of Lysimachus caused a synoecism of Sesamus, Cytorus, Cromna, all towns mentioned in the Iliad, and Tium after her separation from Lysimachus, to form the new community of Amastris. Tium, says Strabo, soon detached itself from the community, but the rest kept together, probably in 282 BCE, recovered its autonomous status.