Sthenelas (Ancient Greek Σθενέλας) was a mythical king of Argos, son of Crotopus in Pausanias' native succession. He fathered Gelanor (Pelasgus Gelanor), whose claim Danaus contested when he returned from Egypt and took the Argive throne.
Adapted from Wikipedia, "List of kings of Argos" and Pausanias · CC BY-SA 4.0
I.Argive succession
Pausanias (Description of Greece 2.16.1, 2.19.3) places Sthenelas after Crotopus in the Inachid line and makes him father of Gelanor. When Danaus arrives from Egypt, Gelanor's kingship is contested and yields — the hinge from native Inachids to the Danaid dynasty.
Eusebian and related lists often write "Sthenelos" between Crotopus and Gelanor; the atlas keeps the Pausanian spelling Sthenelas for this pre-Danaid king.
II.Homonyms
Not Sthenelus son of Capaneus (sthenelus-epigoni), who later inherits a third of Argos after the Epigoni; nor Sthenelus son of Perseus (sthenelus-perseid), father of Eurystheus. Spellings and generations differ.