Nicomēdes in Harpers Dictionary of Classical Antiquities (1898)
Nicomēdes I., king of Bithynia, was the eldest son of Zipoetes, whom he succeeded, B.C. 278. With the aid of the Gauls, whom he invited into Asia, he defeated and put to death his brother Zipoetes, who had for some time held the independent sovereignty of a considerable part of Bithynia. The rest of his reign appears to have been undisturbed, and under his sway Bithynia rose to a high degree of power and prosperity. He founded the city of Nicomedia, which he made the capital of his kingdom. The length of his reign is uncertain, but he probably died about 250. He was succeeded by his son Zielas.