Eric IX, also known as Eric the Saint, was a king of Sweden who reigned during the 12th century. He is often credited with promoting Christianity in the region and is considered a significant figure in the establishment of the Swedish church. His reign is marked by efforts to unify the various tribes in Sweden under a single rule. Eric IX was canonized as a saint by the Catholic Church after his death, and his feast day is celebrated on May 18. He is remembered for his pious life and dedication to spreading Christianity, which laid the groundwork for the future religious landscape of Scandinavia.