Date Saturn was discovered.?

Answer 1

Saturn, as a "wanderer" or star-like object observed to move separately from the other stars, was known to the ancient Mesopotamians, Mayans, Egyptians, and Greeks, and was probably known to pre-literate humans.

Answer 2

Saturn can be obseved with naked eye, so it was known since ancient times.

In 1655, Christiaan Huygens became the first person to suggest that Saturn was surrounded by a ring

Answer 3

Saturn is visible to the naked eye (just like Mercury, Venus, Mars, and Jupiter), so even the ancients knew about it.