 Complete the following phrase:  As the only legitimate son of Napoleon I, he was already constitutionally the Prince Imperial and heir apparent, but the Emperor also gave his son the style of King of Rome. Three years later, the First French Empire collapsed. Napoleon I saw his second wife and their son for the last time on 24 January 1814. On 4 April 1814, he abdicated in favour of his three-year-old son after the Six Days Campaign and the 