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Who discovered Titan in 1655?

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Titan Titan, moon of Saturn, photographed by Voyager 2 on August 25, 1981, at a distance of 907,000 km (564,000 miles). Green and violet images were combined to make this photograph, which shows the extended atmosphere of the satellite.

Titan, the largest moon of Saturn, was discovered in 1655 by the Dutch scientist Christiaan Huygens.1

While the astronomer Gian Domenico Cassini is credited with discovering four other moons of Saturn—Iapetus, Rhea, Tethys, and Dione—between 1671 and 1684, he was not the discoverer of Titan.2