The son of King Pelias of Thessaly, Acastus.
8 seconds sound clip from the Jason and the Argonauts (1963) movie soundboard.
You can hear this line at 01:21:34 in the Blu-ray version of the movie.
Quote context
[...]
- It has brought wealth and peace to Colchis.
- And should we ever let it go, it would mean plague and famine and the destruction of our country!
- We give our thanks to one person. The person who exposed a criminal attempt on our kingdom...
- The son of King Pelias of Thessaly, Acastus.
- Hecate, queen of darkness, you've always helped me. Tell me now what I must do.
- You, who gave me the gift of foresight, why didn't you reveal to me Acastus treachery?
- He who sits drinking with Aeetes, while Jason, imprisoned, condemned to death.
[...]