Frederick IV of Denmark vs John Frederick I of Saxony

Frederick IV joined the Great Northern War against Sweden, forming an alliance with Russia and Saxony. Denmark's early campaigns failed, leading to the Treaty of Travendal in 1700, which temporarily removed Denmark from the war.

Frederick IV abolished the stavnsb

After Sweden's defeat at Poltava, Frederick IV re-entered the Great Northern War. Danish forces invaded Scania but were repelled at the Battle of Helsingborg in 1710, failing to regain lost territories.

Frederick IV signed the Treaty of Frederiksborg ending the Great Northern War for Denmark. Denmark gained the Duchy of Schleswig but failed to recover Scania, and Sweden paid a war indemnity.

John Frederick I succeeded his father John the Constant as Elector of Saxony, becoming the head of the Ernestine line. He inherited a leading role in the Schmalkaldic League and the defense of Lutheranism in the Holy Roman Empire.

John Frederick I became the military leader of the Schmalkaldic League, the Protestant alliance against Emperor Charles V. He commanded the league's forces in several campaigns, including the conquest of the Duchy of Brunswick-Wolfenb

John Frederick I was decisively defeated and captured by Imperial forces under Charles V at the Battle of M

After his capture at M

John Frederick I was imprisoned by Emperor Charles V after the Battle of M

John Frederick I was released from Imperial imprisonment as part of the Treaty of Passau, which granted religious toleration to Lutherans. He returned to his reduced territories but never regained the electoral title, dying in 1554.