Yes, if he breaks any of the laws of nature, because these are the moral laws for Hobbes.
Violating the laws of nature can be not performing one's valid pacts as a ruler or not seeking peace when others want to do so and also not being grateful.
Moral limits that Hobbes places on the ruler are useless, because when we make a pact with the ruler, we give all of our natural rights away to the sovereign.
We cannot question/revolt because they've our rights.
Can only act if we are in danger ⇒ right to self - defense
