The Moravians have existed in some forms since the 1400s. Their historic antecedents include a group known as the Bohemian Brethren. In the 1700s they became known as the Moravians, with their epicenter in Herrnhut (modern-day Germany), and Count Nicholas Zinzendorf as their main inspiration.
The Moravians, though a smallish church, are primarily known for two things in the 1700s:
100 years of non-stop prayer, with people praying in one-hour segments. Sending out missionaries all over the world.
Indeed, the Moravians were the most active group in worldwide missions before Williams Carey founded the modern missions movement.
This is not a great book; but the Moravians are an intriguing, even inspiring, group.