The foreign policy of King Christian's later days was regulated by peace following the Treaty of Speyer (1544).
He carefully avoided all foreign complications; refused to participate in the Schmalkaldic War of 1546; mediated between the Emperor and Saxony after the fall of Maurice of Saxony at the Battle of Sievershausen in 1553.
In 1549, he began the building of Landskrona Citadel.
He also rebuilt Sønderborg Castle, converting it from a fortress into a four-winged castle in the new Renaissance syle, between 1549 and 1557.
In February 1555, he interceded successfully on the behalf of the English Bible translator and Bishop of Exeter, Miles Coverdale (1488–1569), who had been imprisoned for two and a half years by Queen Mary I of England.
 Coverdale was then released and allowed to leave England.

King Christian III died in 1559 on New Year's Day at Koldinghus, and was interred in Roskilde Cathedral in a funerary monument designed by Flemish sculptor Cornelis Floris de Vriendt (1514–1575).
The foreign policy of King Christian's later days was regulated by peace following the Treaty of Speyer (1544). He carefully avoided all foreign complications; refused to participate in the Schmalkaldic War of 1546; mediated between the Emperor and Saxony after the fall of Maurice of Saxony at the Battle of Sievershausen in 1553. In 1549, he began the building of Landskrona Citadel. He also rebuilt Sønderborg Castle, converting it from a fortress into a four-winged castle in the new Renaissance syle, between 1549 and 1557. In February 1555, he interceded successfully on the behalf of the English Bible translator and Bishop of Exeter, Miles Coverdale (1488–1569), who had been imprisoned for two and a half years by Queen Mary I of England.  Coverdale was then released and allowed to leave England.
King Christian III died in 1559 on New Year's Day at Koldinghus, and was interred in Roskilde Cathedral in a funerary monument designed by Flemish sculptor Cornelis Floris de Vriendt (1514–1575).
Christian III of Denmark