I understand that the current method of styles and titles for members of the British Royal Family came with the reign of King George I of Great Britain.

I'm having a difficult time finding out what members of the Royal Family were called prior to this.

For example, George, Duke of Clarence, the brother of King Edward IV and King Richard III...was he considered or titled as a Prince of England or was he George Plantagenet and considered "simply" a nobleman and not "royalty?" What was the style for royal dukes in those days?

I've heard that after the future Edward II was created Prince of Wales all subsequent Prince's of Wales were the only ones considered a Prince or to actually be titled as a Prince in England.

I believe that the future Queen Mary I and her half sister Queen Elizabeth I were sometimes addressed as Princess and sometimes addressed as "Lady." Same goes for the future Queen Anne who was addressed as Lady Anne at her marriage to Prince George of Denmark.

Where titles of royalty less regulated and we're more informal prior to George I?