Acastus

Acastus was a Tok'ra operative.

Biography
He worked for Queen Helen's household on the planet Aegis about a half-century ago, Helen aware of a Helots named Acastus worked in her household. Helen then discovered his true identity to Acastus actually was a Tok'ra operative. After a long night of discussions he could convince Helen to just the Tok'ra thing. Helen agreed to keep their secret.

As time passed, their relationship deepened and they became lovers. They did their best to keep it a secret, but Alexander discovered their relationship and tried to kill Acastus, which he thought was a simple Helots. Since In symbiote Acastus survived but his host body was too badly injured to live.

He asked Helen allowed to mix with her, and she went. Unfortunately trauma was too great. Acastus survived a day after the mixture, his death blow her but she was comforted by the remaining memories of his life. He never got to meet his son who Helen was with him. (RPG: "Stargate SG-1: Living Gods: Stargate System Lords")