Once the normal party of Roman, Da Vinci, Mash and Fujimaru convene to discuss the previous Singularity, Da Vinci reveals that the 72 Demon Gods were familiars of an ancient king of Israel, the greatest summoner in history, but the discussion then turns toward there not being enough information to make a definite call.
Previously, the first part of the story, the game’s prologue, was adapted into Fate/Grand Order First Order, a single 45-minute long episode.
In Fate/Grand Order, the Babylonia arc is either the seventh or eighth Singularity, depending on whether you count Fuyuki (which First Order adapted) or Orleans as the first.