Door of the Schlosskirche (Castle Church) in Wrttenberg to which Luther is said to have nailed his 95 Theses on the 31 of October 1517 sparking the Reformation.
I saw another angel fly in the midst of heaven, having the everlasting gospel to preach. This passage, traditionally interpreted as referring to Luther, is commonly the text preached on during Reformation Day Services.Martin Luther By Lucas Cranach