Gustavus I, also known as Gustavus Vasa, Gustav I, and Gustav Eriksson, was a Swedish king who founded the Vasa dynasty and ruled from 1523 until his death in 1560. He is known for his successful efforts in strengthening and consolidating the Swedish state, separating the Church of Sweden from the Catholic Church, and establishing the Swedish navy. The name Gustavus I is often used interchangeably with Gustavus Vasa, who is also referred to as Gustav I. In addition, Gustav Eriksson is typically used to refer to his birth name before he became king. These synonyms for Gustavus I highlight his importance and contributions to Swedish history and culture.