In Gall Force: Eternal Story, the Solnoids are the precursors of humanity; in Gall Force: Stardust War it's also revealed that the Solnoids also have precursors. Finally, in Gall Force: New Era, it's revealed that due to a Stable Time Loop, all the races in the story are each other's precursors.
David Brin's Uplift series. The original Precursors, the Progenitors, existed a billion years ago. They uplifted non-sapient races into intelligent beings. The races they created themselves uplifted more species, and the process has continued to the present day.
In Larry Niven's Known Space universe, there are two sets of precursors. First there were the Thrintun (AKA "Slavers"), who seeded the galaxy with the ingredients of life so it would grow and evolve into unique delicacies for them to eat (being hypnotic slavers, they were defeated by the Tnuctipun in the inevitable Turned Against Their Masters, and they took all sentient life with them. Talk about bad parenting). Then there were the Pak, a race of more recent aliens with three life stages (child, breeder, Protector) only sentient in the third stage, and programmed to be homicidal to anything that could conceivably threaten their descendants (mutations were not recognized). Earth was a Lost Colony of them who couldn't advance to Protector stage when their supply of tree-of-life root ran out due to a lack of thallium in Earth's soil.
Babylon 5: Lorien and the rest of his kind were this to the other First Ones, like the Vorlons and the Shadows.
Battlestar Galactica: The People of Kobol were Precursors to the People of Earth and the 12 Colonies, but there was presumably no one before them unless you count whatever "It" is that doesn't like being called "God" and the Head People.
In Red Dwarf it is speculated that all life in the universe originated on Earth, with humans acting as The Precursors to countless other races, who in turn acted as Recursive Precursors to even more sentient creatures.
In the Stargate Verse, the Goa'uld were originally thought to be the ones who had built the Stargate network, come to Earth to find slaves, and built the Pyramids to land their spaceships. SG-1 quickly discovers that while the Goa'uld were indeed the ones on Earth thousands of years ago, the Stargates were actually built by their precursors, the Ancients, millions of years ago. Stargate Universe revealed that the Ancients had found signs of their own Precursors (or God), but the series ended before they could be revealed.
In Greek Mythology the first major figures are Gaia and Uranus, whose children were the Titans, many monsters, and the Gold race of men who died out by not reproducing. Then Cronos, the leader of the Titans, castrated Uranus and overthrew him, then Cronos' kids overthrew him (yeah, they've kind of got a children killing their parents theme here). Also Zeus created the Silver race of men, but they were too warlike and he had to destroy them, so Prometheus made the Bronze race who were our ancestors.
Norse Mythology is kind of similar, with Odin and his brothers killing the primeval giant Ymir, making the world out of his body, and instituting the rule of the Aesir.
In Homeworld, the anchient Hiigarans left their warp core to be discovered by the Kushans 3000 years later. But the Anchient Hiigarans never built the core, they found it. It was made by a still older race known only as the Precursors, who, according to legend, are said to have originated from beyond the galaxy.
Halo's Forerunners had the preceding species Precursors, who were rumored to have exceeded technology and become transentient. By the time of the Flood invasion, many believed the Precursors were legend, unaware that they had defeated the Precursors millennia before and the Flood was their revenge.
Forgotten Realms elves dominated Faerun before they torn both continent and their civilizations apart in Crown Wars, which left them weakened and gradually displaced by Dwarven and Giant kingdoms and then humans. But the Elves in turn took the world from Dragons' claws. That's where we switch from merely mythical era to the Time Abyss of Creator Races about whom little is known: Dragons knocked birdlike Aearee out of Toril's sky... and before their time there were Batrachi, Sarrukh and Fey.
Five hats means that five tropers think it is ready to publish.
You are saying that you think this draft is ready to be published. That means the description is not ambiguous,
it doesn't duplicate an existing trope, there are at least three examples, and the title makes sense.
Is that what you meant to do?
You are saying this draft has a ready-to-publish hat it does not deserve and you are taking it back.