Louis Charles proclaimed Louis XVII on his fathers death .
He was believed to have only survived until the age of 10 having been brutally abused by the revolutionaries that kept him , his mother and sister under lock and key at the Temple prison .
Louis Charles proclaimed Louis XVII on his fathers death , although he was believed to have only survived until the age of 10 having been brutally abused by the revolutionaries that kept him , his mother and sister under lock and key at the Temple prison .