Hassan al-Banna
The concept of the modern Islamic state has been articulated and promoted by ideologues such as Mohammed Omar, Abul A'la Maududi, Ayatollah Ruhollah Khomeini, Israr Ahmed, Sayyid Qutb or Hassan al-Banna. Implementation of Islamic law plays an important role in modern theories of the Islamic state, as it did in classical Islamic political theories. However, the modern theories also make use of notions that did not exist before the modern era.