King Frederick VII was the monarch of Denmark from 1840 until his death in 1863. He was the last king of the House of Oldenburg and is known for his role in the transition of Denmark towards a constitutional monarchy. His reign saw significant political changes, including the introduction of the first democratic constitution in 1849. Frederick VII's rule was marked by challenges, including conflicts with the duchies of Schleswig and Holstein. His decisions during this period contributed to the tensions that eventually led to the Second Schleswig War in 1864. Despite these challenges, he is remembered for his efforts to modernize Denmark.