Aalborghus Castle (Danish: "Aalborghus Slot" ) is a castle in Aalborg, Denmark.
 It is a half-timbered (bindingsværk) castle built by King Christian III from 1539 to around 1555 initially as a fortification.
 Soon it became the seat of the king's provincial governors in Northern Jutland, and after the introduction of absolutism, became used by the State County of Northern Jutland for taxes.
Christian III (12 August 1503 – 1 January 1559) reigned as king of Denmark from 1534 until his death and Norway from 1537 until his death.
 During his reign, Christian established Lutheranism as the state religion within his realms as part of the Protestant Reformation.
The Count's Feud (Danish: "Grevens Fejde" ), also called the "Count's War", was a civil war that raged in Denmark in 1534–36 and brought about the Reformation in Denmark.
 The Count's Feud takes its name from the Protestant Count Christopher of Oldenburg, who supported the Catholic King Christian II, deposed in 1523, over the election of Christian III.
The Icelandic Reformation took place in the middle of the 16th century.
 Iceland was at this time a territory ruled by Denmark, and Lutheran religious reform was imposed on the Icelanders by King Christian III of Denmark.
 The Icelandic Reformation ended with the execution of Jón Arason, Catholic bishop of Hólar, and his two sons, in 1550, after which the country adopted Lutheranism.
The Treaty of Speyer or Peace of Speyer was signed on May 23, 1544 between Denmark and the Holy Roman Empire during an Imperial Diet of the Holy Roman Empire in Speyer, Germany.
 Danish king Christian III had imposed heavy tolls on the Sound and two other channels between the North Sea and the Baltic sea, in an effort to end the Dutch dominance of trade in the Baltic region.
 Under pressure from Holy Roman Emperor Charles V, he agreed to exempt the Dutch ships from these tolls and give them free and unfettered access to the Baltic.
 In the treaty, Charles V also recognized Christian III as the rightful king of Denmark, and promised not to provide military support to his rival Christian II.
 The Treaty of Speyer dictated Christian III's foreign policy for the rest of his life.
 He kept Denmark at peace, refusing to involve the country in Protestant-Catholic conflicts such as the Schmalkaldic War of 1546.
 The Dutch would continue to dominate Baltic trade for another two centuries.
Josquin Baston (c. 1515 – c. 1576) was a Dutch composer of the first half of the 16th century.
 From the 1550s, he worked as kapellmeister at the court of Christian III.
 After Christian III's death, he found work at a Swedish court.
 A number of his pieces were published in Sigismund Salblinger's "Concentus" (1545), and in the "Leuven Collection" (1554).
Hesselagergård (or Hesselager Manor), located near Gudme in the southeast of the Danish island Funen, is the oldest Renaissance building in Denmark.
 It was built by Johan Friis, one of the most powerful men in Denmark during the reigns of Christian III and Frederick II.
Cornelis Altenan (died 19 September 1558) was a Danish-German builder.
 He was employed by Christian III of Denmark as a bricklayer and carpenter, and was responsible for building the King's fortress in Holstein.
The election of Christian III as king of Denmark and Norway on 4 July 1534 was a landmark event for all of Denmark and Norway.
 It took place in the church in the town of Rye, eastern Jutland, where the Jutlandic nobility elected Prince Christian, son of King Frederick I and Duke of Schleswig and Holsten, as king.
 This brought about the Count's Feud ("Grevens Fejde") and later also led to the implementation of the Protestant Reformation in Denmark and Norway.
Christian III generally refers to Christian III of Denmark.
 It may also refer to:

Question: Christian III reined as king of both Denmark and which other country?
Answer: Norway