Memory

When Merlin is thrown in prison for sorcery Gaius gives Arthur a journal as one last plea for his wards life. The Journal is said to contain the Memoirs of Merlin before he came to Camelot. What will Arthur discover about his servant? Rated T for heartwrenchingness (One of my OC's is in this OMG I LOVE HER) tiny bit of Mergana I'll explain later. :)