Final answer:
Triopas, one of the Heliadae, married Cydippe and succeeded Ochimus as ruler of Rhodes.
Step-by-step explanation:
The man in question, who was one of the Heliadae, married Cydippe, the daughter of his brother Ochimus, and eventually succeeded Ochimus as ruler of Rhodes is Triopas. The Heliadae were the children of Helios, the sun god, and Rhodes was an island that was said to have been especially favored by Helios. In Greek mythology, the stories of gods, demigods, and heroes often intersect with the rulership of ancient places, providing a rich tapestry of narrative and lineage as seen here with the legend surrounding the succession of the Rhodian throne.