Ali ibn Husayn, also known as Zain al-Abidin, was the fourth Imam in Shia Islam and the son of Husayn ibn Ali. He was born in 658 CE and is known for his piety and devotion to God. After the tragic events of the Battle of Karbala, where his father was martyred, Ali ibn Husayn became a prominent figure in the Islamic community, emphasizing the importance of justice and spirituality. He is best known for his work, Sahifa Sajjadiya, a collection of supplications and prayers that reflect his deep spiritual insights. Ali ibn Husayn's teachings focus on ethics, morality, and the importance of social justice, making him a revered figure among both Shia and Sunni Muslims. His legacy continues to inspire millions around the world.