The ancient group known as The Architects are credited with saving the planet Livno III by building the Breeze, Rain, and Solstice Globes. These globes worked in conjunction to power a device that controlled the environmental conditions of the planet.
Justina Ireland's 2018 young adult novel, Lando's Luck, included the first reference to the Architects. Within Star Wars Legends continuity, the ancient Celestials were sometimes called the Architects.
In canon, the Celestials were referenced in the comic book series Lando - Double or Nothing 2, though no link has yet been confirmed between the Celestials and the Architects.