Christiaan and his brother, Constantijn, started to build their own telescopes in 1650. Using the first telescope he ever built, Christiaan Huygens was able to see Titan. At first he called it "Luna Saturni", which means "Saturn's moon" (he did not know there was more than one). Through the years, lots of other moons have been discovered and today the moon is known as "Titan" or as "Saturn VI". The name "Titan", and all the names of Saturn's other moons, are from the Greek legends.