Frederick II of Denmark was a king who ruled from 1559 to 1588. He was born on July 1, 1534, and was the son of Christian III. Frederick II is known for strengthening the Danish monarchy and expanding its influence in the Baltic region. He also promoted trade and supported the arts, contributing to the cultural development of Denmark. During his reign, Frederick II engaged in several military conflicts, including the Northern Seven Years' War against Sweden. He was a patron of the famous Kronborg Castle, which became a symbol of Danish power. Frederick II's reign is often seen as a significant period in Danish history.