The kings of which country have alternatively been called Christian or Frederick since 1513?
Christian II of Denmark Christian II of Denmark Christian II (1 July 1481 – 25 January 1559) was a Scandinavian monarch under the Kalmar Union. He reigned as King of Denmark and Norway from 1513 until 1523 and of Sweden from 1520 until 1521. From 1513 to 1523, he was concurrently Duke of Schleswig and Holstein in joint rule with his uncle Frederick. Christian was the oldest son of King John and belonged to the House of Oldenburg. Denmark was then an elective monarchy in which the nobility elected the new king (from among the sons or close male relatives of the previous monarch),
Christian Frederick Hassé named Hasse living in Fulbeck. In 1808 Christian Friedrich Hassé married Ann Cossart. The marriage produced six recorded children. At the age of 60 (or 61: sources differ) Christian Frederick Hassé died suddenly on 1 May 1831 and was buried at the Moravian Church in Fulbeck on 5 May 1831. In 1851 it was recorded that Hassé had written many hymns which had not been "collected", and it is not known whether any subsequent attempts have been made to collect and index his compositions. In 1822 he had published in London, "Polyhymnia, or Select Airs by celebrated foreign Composers, adapted