Frederik 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. Frederik II is known for strengthening the Danish monarchy and expanding its influence in the Baltic region. He also supported the arts and sciences during his reign. Frederik II was a key figure in the Northern Wars, which helped to establish Denmark as a significant power in Northern Europe. He built the famous Kronborg Castle, which is now a UNESCO World Heritage site, and promoted trade and commerce, contributing to Denmark's economic growth.