Category:Knights of the Order of the Dannebrog(For other people named Christian Hansen, see Christian Hansen.) Hans Christian Hansen (20 April 1803 – 2 May 1883) was a Historicist Danish architect who worked 18 years in Greece where he was active in the transformation of Athens from a small town to the country's capital and an international metropolis. Later in his career he returned to Denmark, where he became a professor at the Royal Danish Academy of Fine Arts and designed buildings such as the Copenhagen Municipal Hospital and the Østervold Observatory. He was the brother of Theophilus Hansen who was also an internationally successful architect, active in Athens and Vienna. He is considered to be a pioneer in the study and application of polychrome architecture.