What were the ancient aliens in "The Fifth Element" called?

The answer is: Mondoshawan

The Mondoshawan are those chunky, golden-armored aliens who lumber into Earth's business at the start of "The Fifth Element" to grab the stones and protect Leeloo. In the divine language of the film's universe, their name translates to guardian. Although, considering how easily they were defeated by the Mangalores, they might want to leave guarding the galaxy to Star-lord and Rocket Racoon.

Their unique design blends ancient and futuristic elements, looking like something that could have stepped out of both an Egyptian tomb and a distant galaxy. For such a super cool suit, they were unfortunately extremely hot. For the handful of guys cast, they could only film for 15 minutes at a time before needing a breather. The massive suit weighed over 100 pounds and had absolutely zero ventilation. Imagine wearing a solid gold sauna in the middle of summer.

Besson kept the Mondoshawan pretty mysterious throughout the film, giving us just enough to make them interesting but not enough to ruin their otherworldly vibe. The production team went all out building this amazing full-size animatronic Mondoshawan that probably cost a fortune... and then it shows up for maybe three seconds when they meet the priest in Egypt. Classic Hollywood.