Who is His Imperial Highness Alexis Nicolaievich from Nicholas and Alexandra and what is their importance?

His Imperial Highness Alexis Nicolaievich was the last child born of Nicholas and Alexandra on August 12, 1904. As the only male, he was the heir to the throne. As a sufferer of hemophilia, he lived in a more protected environment that he normally would as heir. The hemorrhaging meant that he suffered immense pain and could not play normally. At the age of thirteen, he was executed along with his family in Ekaterinburg.