Originally posted by: harianjana
what janaki did said was completely right, Tri devi are three parts of Adishakthi's enormouse power. actually according to some puran it was said that In the start of universe, Adishakthi was the prime one after whom Shiva was born. After shiva, Vishnu, and Brahma was born and Adishakthi had the trishul and third eye at first which she gave to shiva. Shiva getting what Adishakthi wishes did fire her with help of third eye and divided that ash into 3 parts and thos three parts were later reborn as Lakshmi,devi and saraswathi this is what one purana says. there are many concepts like this.
But coming to Radha rani,she was not Adishakthhi. She was considered as the incarcination of lakshmi in Krishna tathv. But here arises another doubt as it was said that Rukminidevi was also the incarcination of lakshmi Devi, but actually it had a explanation that, Every person has his life partner in two forms... One is the Premasaathi(Love) and other is the Karmasaathi(Responsiblity) . Generally these both are referred to his wife only, but in the Krishnavatar Narayan gave a good difference for these two , in Krishnavatar Radha was the premsaathi of Krishna , where as Rukmini was the Karmasaathi. So it was often rumoured that The lakshmi's Premsaathi roop incarcinated as Radha while the karma sathi roop incarcinated as Rukmini. If we go on saying there are many theories like this... But what ever was theory there was no where said that radha was Adishakthi's incarcinatuion, she was always consdiered as lakshmi's incarcination only