This poster was very interesting to me because I have never seen anything like it that has to do with the Reformation. It is a symbol supporting Luther and his ideas. http://www.history.com/topics/martin-luther-and-the-95-theses
Martin Luther was very influential during the Reformation. He went against some of the ideas of the Roman Catholic Church. People eventually starting following his ideas.
The printing press was a very important technological advancement during the Reformation. It published and made books such as the Bible more accessible and gave a greater incentive for people to learn how to read.
This is a map of the dominant religions during the Protestant Reformation. The Lutheran, Calvinist, Catholic, Anglican, and the Huguenots were the most popular religion during this time period. https://www.britannica.com/event/Reformation