So before we get started with actually nailing things to walls, which we're going to do in a few minutes, we want to kind of set the major idea, which is really in the vocabulary itself. It's the Protestant Reformation, protest reform. And the big thesis, the big idea, is that this is a humongous turning point in world history, not only in terms of church stuff and religious stuff, but in terms of political stuff and the future of humankind. So it's a really, really big deal and we'll go over kind of its major effects towards the end of the video. But in terms of context, the 15th century, the end of the 1400s, the beginning of the 1500s, the Catholic Church is the dominant player and it's extravagantly in power. Is that a word, extravagantly in power? But it's humongously in power.