For several hundred years, the Land of Israel was organized into a confederacy of twelve tribes ruled by a series of Judges. After that came the Israelite monarchy, established in 1000 BCE under Saul, and continued under King David and his son, Solomon. During the reign of David, the already existing city of Jerusalem became the national and spiritual capital of the United Kingdom of Israel and Judah. Solomon built the First Temple on Mount Moriah in Jerusalem.