Who is the sun god, the son of Hyperion, who had sacred cattle on the island of

Thrinacia?

Helios

Explanation:

Helios, son of Hyperion and Theia, had his cattle, also called the oxen of the sun. While they grazed on the island of Thrinacia, Odysseus's men (against his orders) killed some of the oxen for food. Helios was enraged and convinced Zeus after they had left the island to kill all of Odysseus's men with lightning.

The sun god was Helios.