Triopas or Triops (Ancient Greek Τρίωψ) was a mythical king of Argos, son of Phorbas in the Inachid succession. Pausanias places him among the native Argive kings and makes him father of Iasus and Agenor; later genealogies connect his house to Io and to Argive seer lines. He is not the Thessalian Triopas punished by Demeter, nor the Rhodian Heliad who fled to Caria.
Adapted from Wikipedia, "Triopas" · CC BY-SA 4.0
I.King of Argos
In the Inachid king-list Triopas succeeds Phorbas. Pausanias' Argive succession (Description of Greece 2.16.1) treats him as a native king; Wikipedia's stub also notes a daughter Messene in one strand.
His sons Iasus and Agenor continue the Argive stem toward Crotopus, Gelanor, and the arrival of Danaus. Through this house later myth reaches Io and the seer lineages of Argos.
II.Homonyms
This node (triopas-argive) is Phorbas' Argive son only. He is not Triopas son of Poseidon and Canace — the Thessalian who tore Demeter's temple and was set among the stars with a serpent — nor Triopas the Heliad who killed Tenages and founded Knidos in Caria.