Peace of Augsburg

The Peace of Augsburg established the principle of cuius regio, eius religio, which translates to whose realm, his religion. This allowed the rulers of the various states within the Holy Roman Empire to choose whether their territory would follow Lutheranism or Roman Catholicism. However, subjects who did not wish to follow their ruler's chosen faith were legally permitted to sell their property and emigrate.

The treaty officially ended the religious warfare between the Catholic forces of Emperor Charles V and the Lutheran Schmalkaldic League. It was the first time the Holy Roman Empire legally recognized Lutheranism as a valid religion, granting it parity with Catholicism. The treaty temporarily halted the spread of the Protestant Reformation's armed conflicts in Germany.

No, a major flaw of the treaty was that it only officially recognized Catholicism and Lutheranism. Followers of Calvinism and other reformed faiths were excluded from the agreement and denied legal protection. This massive oversight would eventually lead to further religious friction and help spark the devastating Thirty Years' War in 1618.

The primary signatory for the Catholic side was Holy Roman Emperor Charles V, who was deeply exhausted by decades of war. However, the actual negotiations were largely handled by his brother, Ferdinand I, who succeeded Charles as Emperor later that year. Maurice, Elector of Saxony, was the primary leader of the Protestant forces who forced the treaty into existence.