Question: What nationality was the composer of the symphonic poem Prince Rostislav ? 

Context paragraphs:
Sergei Rachmaninoff: Sergei Vasilievich Rachmaninoff (Russian: Серге́й Васи́льевич Рахма́нинов , "Sergey Vasilyevich Rakhmaninov"; ] ; 1 April [O.S. 20 March] 1873 28 March 1943) was a Russian virtuoso pianist, composer, and conductor of the late-Romantic period, some of whose works are among the most popular in the romantic repertoire.

Prince Rostislav (Rachmaninoff): Prince Rostislav is a symphonic poem by Sergei Rachmaninoff.  It was composed when he was a student at the Moscow Conservatory, and is one of his earliest surviving compositions for orchestra.  A typical performance of the work lasts from sixteen to twenty minutes.

Prince Rostislav Romanov (1938–1999): Prince Rostislav Rostislavovich Romanov (3 December 1938 – 7 January 1999) was a descendant of the Imperial Family of Russia and a merchant banker.

Ballad of Blaník: Ballad of Blaník (Czech: "Balada Blanická" ), originally titled The Knights of Blaník (Czech: "Blaničtí rytíři" ), is a symphonic poem composed in 1920 by Leoš Janáček, based on a text by Jaroslav Vrchlický.  It was Janáček's third symphonic poem.  The piece is written in the key of A♭ minor.  Its première was in Brno on 21 March 1920.

Sadko (musical tableau): Sadko, Op.  5, is a "musical tableau" by Nikolai Rimsky-Korsakov, written in 1867 and revised in 1869 and 1892.  It is sometimes called the first symphonic poem written in Russia.  It was first performed in 1867 at a concert of the Russian Musical Society (RMS), conducted by Mily Balakirev.  Rimsky-Korsakov later wrote an opera of the same name which quotes freely from the earlier work.  From the tone poem the composer quoted its most memorable passages in the opera, including the opening theme of the swelling sea, and other themes as leitmotives - he himself set out to "utilize for this opera the material of my symphonic poem, and, in any event, to make use of its motives as leading motives for the opera".

Héroïde funèbre (Liszt): Héroïde funèbre , S. 102, is a symphonic poem written by Franz Liszt in 1850 and published in 1857 as No. 8.  The work originated as the first movement of a planned "Revolutionary Symphony" inspired by the July Revolution.  Liszt pays homage in this programmatic symphonic poem to the soldiers and men that died fighting in revolutionary efforts.  The composition of this piece was started in 1830 as a brief sketch for a full symphony, but was dropped by Liszt in the continuing of other works.  However, in 1848, there was an uprising in Liszt's home country of Hungary.  One of Liszt's friends was killed during this revolution, which caused Liszt to revisit his now 20 year old sketch of the Revolutionary Symphony, shortening it and forming the first movement into the commemorative Héroïde funèbre.  Liszt said of the program, "In these successive wars and carnages, sinister sports, whatever be the colours of the flags which rise proudly and boldly against each other, on both sides they float soaked with heroic blood and inexhaustible tears.  It is for Art to throw her ennobling veil over the tomb of the brave, to encircle with her golden halo the dead and dying, that they may be the envy of the living."

Final Symphony: Final Symphony is a symphonic concert tour first held at the Historische Stadthalle Wuppertal in Wuppertal (Germany) on May 11, 2013 and continuing to date.  The concert tour features arrangements of video game music selected from the "Final Fantasy" series, specifically "Final Fantasy VI", "VII", and "X".  It is divided into three acts: a symphonic poem for "VI", a piano concerto for "X", and a symphony for "VII".  The concert is produced and directed by Thomas Böcker, with arrangements provided by Finnish composer and musician Jonne Valtonen, along with Roger Wanamo and "Final Fantasy X" composer Masashi Hamauzu with consultation from "Final Fantasy" composer Nobuo Uematsu.  The original works were composed by Uematsu and Hamauzu, and an introductory piece was composed by Valtonen.  The premiere concert was performed by the Wuppertal Symphony Orchestra under conduction from Eckehard Stier, with guest performer Benyamin Nuss joining the orchestra on piano.

Prince Rostislav Alexandrovich of Russia: Prince Rostislav Alexandrovich of Russia (2 November 1902 – 31 July 1978) was the fifth son and sixth child of Grand Duke Alexander Mikhailovich and Grand Duchess Xenia Alexandrovna.  He was a nephew of Tsar Nicholas II, Russia's last tsar.

Prince Rostislav (poem): Prince Rostislav (Князь Ростисла′в) is a poem by Alexey Konstantinovich Tolstoy first published in the April 1856 issue of "The Russian Messenger" (book 1, pp. 483-484), subtitled "The Ballad".

Symphonic poem: A symphonic poem or tone poem is a piece of orchestral music, usually in a single continuous movement, which illustrates or evokes the content of a poem, short story, novel, painting, landscape, or other (non-musical) source.  The German term "Tondichtung (tone poem)" appears to have been first used by the composer Carl Loewe in 1828.  The Hungarian composer Franz Liszt first applied the term "Symphonische Dichtung" to his 13 works in this vein.

Supporting paragraphs: Prince Rostislav (Rachmaninoff) Sergei Rachmaninoff
Answer: Russian