The concept of a "Maximally Great Being" refers to a being that possesses all possible perfections to the highest degree. This includes attributes such as omniscience (all-knowing), omnipotence (all-powerful), and omnibenevolence (all-good). The idea is often discussed in philosophical and theological contexts, particularly in arguments for the existence of God. Philosopher Anselm of Canterbury introduced this idea in the 11th century, arguing that if such a being exists in the mind, it must also exist in reality, as existence in reality is a perfection. This concept has been influential in various debates about the nature of divinity and the characteristics of God.