The revolutionary leader in Saudi Arabia known for unifying the country is King Abdulaziz Al Saud, also known as Ibn Saud. He played a pivotal role in the creation of modern Saudi Arabia through a series of military campaigns starting in the early 20th century, culminating in his declaration of the Kingdom of Saudi Arabia in 1932. Abdulaziz utilized a combination of military prowess, alliances with tribal leaders, and a unifying vision of a nation grounded in Islamic principles to consolidate various regions and tribes under his rule, establishing a modern state in the Arabian Peninsula.