Uenglingen gate was built ca. 1450-1460 and is regarded to be amongst the finest late medieval city gates amongst those built in the northern German brick Gothic style, only surpassed by the Holsten Gate in Lübeck. The gate is believed to have been built by Stefan Boxthude, one of the most reknowned masterbuilders of the 15th century. The gate's tower, boasting sheer rounded ramparts, was originally the main gate of larger defensive fortifications that also included a foregate and a ward (a courtyard enclosed by a circular wall).
References:The Royal Palace was built in the first half of the 19th century as the Norwegian residence of King Charles III, who also reigned as king of Sweden and otherwise resided there, and is the official residence of the present Norwegian monarch. The crown prince resides at Skaugum in Asker west of Oslo. The palace has 173 rooms.
Until the completion of the Royal Palace, Norwegian royalty resided in Paleet, the magnificent town house in Christiania that the wealthy merchant Bernt Anker bequeathed to the State in 1805 to be used as a royal residence. During the last years of the union with Denmark it was used by the viceroys of Norway, and in 1814 by the first king of independent Norway, Christian Frederick.