This page contains information regarding Star Trek: Lower Decks, and thus may contain spoilers.
Stavos Keniclius 5 created the clone in 2269, with the intention of building a clone army to impose peace on the galaxy. When Captain James T. Kirk was able to convince them that the Federation's work made this unnecessary, Keniclius 5 and Spock Two remained on Phylos to try to save the Phylosian species. (TAS: "The Infinite Vulcan")
In 2380, when Ensign Brad Boimler was explaining to Clar that Starfleet officers don't always know what to expect when it came to the unknown, he cited the example of Captain Kirk, who was completely unaware that he was going to meet a "giant Spock on Phylos". (LD: "Veritas")
His skeleton, complete with a tattered sciences division 2260s-era Starfleet uniform was part of the collection of Kerner Hauze in 2381. The skeleton was suspended from the ceiling, but fell on Siggi, killing him. The USS Cerritos away team then attempted to climb over the pile of bones to further their escape. (LD: "Kayshon, His Eyes Open")