who invented the art of LDing does annyone know??
Lucid dreaming is a natural ability, and has probably been discovered by countless people lucid dreaming through history. If you mean who first started training themselves to get more and longer lucid dreams, i don’t know. My guess would be that it has also happened many times in different times and places.
Wikipedia has some info there https://en.wikipedia.org/wiki/Lucid_Dreaming#Cultural_history. It’s actually pretty interesting - lucid dreaming has been around for a long time, but started to be studied/practiced more widely only in the 20th century.
Some people believe that LDing is thousands of years old. In-fact, some people believe that Buddhist monks in deep meditation sometimes encounter Lucid Dreams.