Henryk Hektor Siemiradzki (24 October 1843 – 23 August 1902) was a Polish painter, best remembered for his monumental Academic art. He was particularly known for his depictions of scenes from the ancient Graeco-Roman world and the New Testament, owned by national galleries of Poland, Russia and Ukraine.
Many of his paintings depict scenes from antiquity, often the sunlit pastoral scenes or compositions presenting the lives of early Christians. He also painted biblical and historical scenes, landscapes, and portraits. His best-known works include monumental curtains for the Lviv (Lwów) Theatre of Opera and for the Juliusz Słowacki Theatre in Kraków.
After graduating from the University with the degree of Kandidat he abandoned his scientific career and moved to Saint Petersburg to study painting at the Imperial Academy of Arts in the years 1864–1870. Upon his graduation he was awarded a gold medal. In 1870–1871 he studied under Karl von Piloty in Munich on a grant from the Academy. In 1872 he moved to Rome and with time, built a studio there on Via Gaeta, while spending summers at his estate in Strzałkowo near Częstochowa in Poland.
In 1873 he received the title of Academician of the Imperial Academy of Arts for his painting Christ and a Sinner, based on a verse from Tolstoy. In 1878 he received the French National Order of the Legion of Honour and a Gold Medal of the Paris World's fair for the painting Flower vase. In 1876–1879 Siemiradzki worked on frescoes for the Cathedral of Christ the Saviour (Moscow) among his other large-scale projects. In 1879 he offered one of his best-known works, the enormous Pochodnie Nerona (Nero's torches), painted around 1876, to the newly formed Polish National Museum. The artwork is on display at the Siemiradzki Room of the Sukiennice Museum in the Kraków Old Town, the most popular branch of the museum today. Around 1893 Siemiradzki worked on two large paintings for the State Historical Museum (Moscow) and in 1894 produced his monumental curtain for the Juliusz Słowacki Theatre in Kraków.
He died in Strzałkowo in 1902 and was buried originally in Warsaw, but later his remains were moved to the national Pantheon on Skałka in Kraków.
Henryk Siemiradzki's large-scale canvasses, influenced by the French Académie des Beaux-Arts, are on display at the national museums of Poland, Russia and Ukraine; notably, at the Sukiennice Museum, the National Museum, Poznań, Lviv National Art Gallery, Tretyakov Gallery and others.