royal palace 88The 'Alawi sultans and kings have maintained a palace in Rabat since the 18th-century ren of sultan Mohammed ben Abdallah, who used Rabat as one of his imperial residencesTours of the Royal Palace . The Royal Palace in Oslo is usually open to the public every year from late June until the middle of August. The guided tour takes visitors through some of the most important and lovely rooms in the Palace.