What is the History of Reiki?

The following referenced history of Reiki is taken from Reiki, The Healing Touch, by William Lee Rand and has been carefully researched to contain verified information from dependable sources. 

There have been many attempts to explain the history of Reiki, but unfortunately, in the past, many of them have been based more on myth and an attempt to validate a particular style of Reiki and for the most part, lacked accurate information. Realizing the need for a factually based history of Reiki, I’ve spent over twenty years researching this information based on written records and interviews with those close to its development. The result is the following history of Reiki, which is derived from evidence based facts.