Hos Costil was a member of the Costil family and the son of Supé Costil. His father, Weano Rorriere, was murdered by Supé's relatives before his birth, and she had difficultly getting them to accept her son as part of the family. Throughout his life Hos was eager to please the Costils, working loyally for several senators and making an extremely advantageous marriage to Dreann Excenil. By the time their son was born he was very well liked by everyone. That son was the even more successful Palpatine, who was probably responsible for the death of both of his parents in 32 BBY.