I know about Johnathan Edwards and William Miller being some of the forerunners of the WTBTS. How about much earlier in time? Was there a group during the Middle Ages or even earlier that preached something similar to the WT doctrine? I don't mean bold Protestants, such as Tyndale.
I read about Arianism.
Certainly, these ideas did not appear in a vaccum.
What do people think about Pastor Russell's writings. I find them bizarre but people wrote in different styles than today. Would Russell be considered "wacky" by the standards of his day. I know almost nothing about Adventism.