Tiberius and Gaius Gracchus: Famous for their political reforms known as the Gracchan Reforms. They championed the rights of plebeians (lower-class citizens) and enacted land reform, limiting the amount of land any individual could possess and redistributing excess lands to poor citizens. Tiberus focused on agrarian reforms, while Gaius expanded his reforms to include extending voting rights, founding of colonies for the landless, and regulating public finances. Their efforts led to social tensions and political conflicts with the wealthy and powerful senators, ultimately leading to their downfall.