Frederick William IV was the King of Prussia from 1840 until 1861. He was known for his romantic ideals and his vision of a united Germany, which he believed should be achieved through cooperation rather than conflict. His reign was marked by a mix of conservative policies and liberal movements, particularly during the 1848 revolutions. Despite his initial support for constitutional reforms, Frederick William IV ultimately rejected the offer of the German crown from the Frankfurt Assembly in 1849. His refusal was based on his belief in the divine right of kings, which led to a decline in his popularity and influence. He passed away in 1861, leaving a complex legacy.