Coeus
Κοῖος
The grandfather of Apollo and Artemis.
With his sister Phoebe he fathered Leto and Asteria.
Leto's children are Apollo and Artemis, and Asteria's daughter is Hecate.
One reading links his name to the Greek word for "to ask," which is why he is also called the Titan of intellect.
SourcesHesiod, Theogony