Ludwig van Beethoven wrote Beethoven's 1st Symphony, also it is the first of nine symphonies that he wrote. Full title is - Symphony No. 1 in C major, op. 21 "op" is short for opus. Opus means work, so it is his 21st work.
Symphonie Celtique was created in 1979.
The duration of Symphonie diagonale is 300.0 seconds.
It is difficult to say what the most "famous" piece by any composer is, but the Symphonie Fantastique is a strong contender.
in 1785
La Symphonie fantastique was created in 1942.
La Symphonie Pastorale was created in 1919.
Symphonie diagonale was created on 1924-11-05.
The duration of Eine Symphonie des Kampfwillens is 1200.0 seconds.
Bonn, Germany.
Symphonie is a German band. Symphony is a long and complex sonata for symphony orchestra
Comme une symphonie d'amour was created in 1979.
From what I can tell, his first composition id called Beethovens 9 variations. This not a definite answer as there seems to be very little on the subject, but I hope this helps!