Founder

The Founders were a group of Changelings from the Gamma Quadrant. Though generally considered mythical, they were the ruling force behind the Dominion. (Star Trek: Deep Space 9)

In the late 19th century, a young Changeling encountered a dieing El Aurian named Daniel on the homeworld. When the El Aurian died, the rebellious Changeling mimicked his likeness and took his name out of curiosity. Soon after, the new Daniel was driven to escape the Changeling homeworld as part of a conflict with the link for desiring a life outside the homeworld. (: The Links' Traitor)