Which invention notably aided the spread of Luther's message?

The printing press was a revolutionary invention that significantly aided the dissemination of Martin Luther's message during the Reformation. Invented by Johannes Gutenberg in the mid-15th century, the printing press allowed for the mass production of written works, making books and pamphlets more accessible to a wider audience. Luther utilized this technology to print his 95 Theses and other writings, which criticized the Catholic Church's practices, particularly the sale of indulgences.

As these documents were distributed throughout Europe, they sparked debate, inspired reform, and garnered support for Luther’s ideas, ultimately leading to the Protestant Reformation. Thanks to the printing press, Luther's message reached people quickly and effectively, fostering a shift in religious thought and practice at a scale that was not possible before this technology emerged. This ability to communicate his ideas widely was a key factor in the success of the Reformation and the establishment of Protestantism as a major movement within Christianity.