When was the first solar system model with planets discovered to be a ringed giant?

In 1610, Galileo Galilei observed Saturn through a telescope and noticed unusual “ears” or appendages on either side of the planet. He was seeing Saturn’s ring system, though the telescope of the time was not powerful enough for him to interpret it correctly. Later observations by Christiaan Huygens in 1655 showed that Saturn was surrounded by a ring. Saturn became the first known ringed planet in the Solar System.