 He particularly placed hope in his eldest son, Tsarevich Nicholas.In 1864, Alexander II found Nicholas a bride, Princess Dagmar of Denmark, second daughter of King Christian IX of Denmark and younger sister to Alexandra, Princess of Wales and King George I of Greece.However, in 1865, during the engagement, Nicholas died and the tsar's second son, Grand Duke Alexander, not only inherited his brother's position of tsarevich, but also his fiancée.