Henryk Hektor Siemiradzki (1843 – 1902) was a Polish-Russian 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, Ukraine and Russia. 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 Theatre of Opera and for the Juliusz Slowacki Theatre in Krakow.