Generalized Third Law that depends on the masses of the two bodies. Planets orbit on ellipses with the Sun at one focus.
Period squared is proportional to the size of the semi-major axis cubed.
The Law of Universal Gravitation. Further, Newton generalized the laws to apply to any two bodies moving under the influence of their mutual gravitation. For example, these laws apply equally to The Moon orbiting the Earth. A space probe orbiting the Moon. Two stars orbiting each other.