Nicholas Alexandrovich (; – ) was tsesarevich—the heir apparent—of Imperial Russia from 2 March 1855 until his death in 1865. Early life Grand Duke Nicholas was born on 1843, in the Alexander Palace in Tsarskoye Selo south of central Saint Petersburg, during the reign of his grandfather, Emperor Nicholas I. Nicknamed "Nixa", he was the eldest son of the Tsesarevich Alexander Nikolaevich, eldest son of Emperor Nicholas I, and the Tsesarevna Maria Alexandrovna of Russia. In 1855, his paternal grandfather died, and his father succeeded to the throne as Emperor Alexander II. Nicholas was extremely well-educated and intelligent. His paternal uncle Grand Duke Konstantin called him "the crown of perfection." His history teacher said, “If I succeeded in forming a student equal to Nikolai Alexandrovich once in ten years, I’d think I’d have fulfilled my duties." Nicholas had a close relationship with his younger brother, Grand Duke Alexander. He called Alexander "Pug." On his deathbed, he told his father, “Papa, take care of Sasha, he is such an honest, good man." Engagement In the summer of 1864, Nicholas became engaged to Princess Dagmar of Denmark. She was the second daughter of King Christian IX of Denmark and Louise of Hesse-Kassel and was a younger sister of the Princess of Wales, later Queen Alexandra and wife of the heir-apparent to the British throne, Albert Edward, who reigned as Edward VII. Nicholas was besotted with Dagmar after he saw a photograph of her. On 3 August 1863, he wrote to his mother: "I haven’t fallen in love with anyone for a long time. . . You may laugh but the main reason for this is Dagmar whom I fell in love with long ago without even seeing her. I think only about her.” He was tremendously happy after he proposed to Dagmar in her native Denmark: “How can I not be happy when my heart tells me I love her, love her dearly?. . . How can I describe her? Pretty, direct, intelligent, lively yet shy.” As he continued on his European tour, he wrote love letters to Dagmar every day. Death Until 1865, Nicholas was thought to have a strong constitution. During a tour in southern Europe, he contracted an ailment that was initially incorrectly diagnosed as rheumatism. Nicholas's symptoms at that time included back pain and a stiff neck, as well as sensitivity to noise and light. He thought little