a church. Construction took place between 1862 and 1866 under the direction of Ippolito Monighetti, a Russian architect who had redecorated her apartments in the Catherine Palace in the 1850s. Feeling better, Maria Alexandrovna financed the Mariinsky Theatre in St Peterburg in 1859–1860, built according to the plans of architect Albert Cavos as an opera and ballet house. The theatre opened on 2 October 1860, with a performance of Mikhail Glinka's opera A Life for the Tsar. The new theatre was named Mariinsky after its imperial patroness. (The name was changed during the Soviet period, but the original name was restored in 1992, and at present there is a bust of the Empress in the main entrance foyer.) The humid summers in Saint Petersburg began to take a toll on Maria's frail constitution, to the point she was absent from Russia's capital for long periods of time. In June 1864, she left Russia, accompanied by her husband and their three youngest children, to take the waters in the Bavarian spa of Bad Kissingen. King Ludwig II of Bavaria came to meet his distant aunt and became infatuated with her. In late July, Alexander II returned to Russia, but Maria traveled to Bad Schwalbach, where she celebrated her birthday with Ludwig II. In late August, the whole family was reunited in Darmstadt. As she was still sick, Maria Alexandrovna spent the winter in Nice, where she received the announcement of the Tsarevich's engagement to Princess Dagmar of Denmark. Nicholas was nevertheless in frail health and joined his mother in Nice in early 1865, but was seriously ill with meningitis of the spine by then. Attended by her brother Alexander and her sister-in-law, the Empress did not leave her son's side during his illness. Nicholas was initially misdiagnosed with simple rheumatism and deteriorated rapidly. The whole family gathered around his deathbed on . Princess Dagmar, who was with the Romanovs during her fiancé's final days, was quickly engaged to his brother, the future Emperor Alexander III, whom she would marry the following year. Both Alexander II and Maria were devastated by the death of their eldest son on whom their hopes for the future lay. The Tsarina spent the following year grieving and found some solace with her family in Hesse, since her brother Karl had recently lost his only daughter Anna. In 1866, Alexander II and Maria Alexandrovna celebrated their silver