The princess that Mario frequently has to rescue is Princess Peach. She is the ruler of the Mushroom Kingdom in the Mario series. Princess Peach is a central character in many Mario games, and her kidnapping is often the primary plot element that sets Mario on his adventures.
The main antagonist, Bowser, also known as King Koopa, is usually the one responsible for kidnapping Princess Peach. Mario's quest typically involves navigating through various levels and overcoming challenges to rescue the princess and save the Mushroom Kingdom from Bowser's schemes