Dassid was a Duros male, according to legends, and he held the position of king over the planet Duro. His time as ruler began following the death of his mother, Queen Rana Mas Trehalt. He proceeded to uphold the same strategies his mother had in place, which involved expanding outwards, exploring new planets, and engaging in diplomatic relations with off-world entities.
Following his passing, a lethal trap was put inside his crown. This trap had the capability to kill any person attempting to rob his grave. Dustini Spa Ronii triggered this device on Dagobah as they were trying to get assistance from the Rebel Alliance.