What is the first name of the person who composed something for Jena?
Johannes Brahms, in his Ein deutsches Requiem (A German Requiem), had already opened the way for the composition of a non-liturgical Requiem, written in a language other than Latin while still addressing the traditional theme of rest (requies)  for the dead. In this tradition, Reger's 1915 Requiem, Op. 144b, is also not a setting of the Requiem in Latin, but of Hebbel's poem. He composed it in Jena, a year before his own death, this time for a solo voice (alto or baritone), chorus and orchestra. The Requiem, Op. 144b, was combined with Der Einsiedler (The Hermit), Op. 144a, a setting of a poem by Joseph von Eichendorff, as Zwei Gesänge für gemischten Chor mit Orchester (Two songs for mixed chorus with orchestra), Op. 144. Reger titled the autograph of the piano version: 
Zwei Gesänge / für / gemischten Chor / mit Orchester / Nr. 2) Requiem / (Hebbel), and he wrote the dedication: "Dem Gedenken der im / Kriege 1914/15 gefallenen / deutschen Helden." (To the memory of the German heroes who fell in the War 1914/15).
Reger completed the composition on 25 August 1915. He wrote to the publisher N. Simrock on 8 September: "I've finished two choral works (Der Einsiedler and Requiem). I think I can safely say that they're both among the most beautiful things I've ever written." (Ich habe nun zwei Chorwerke (Der Einsiedler und Requiem) fertig. Ich glaube sagen zu dürfen, daß diese beiden Chorwerke mit das Schönste sind, was ich je geschrieben habe.) Requiem was first published by N. Simrock in 1916, edited by Ulrich Haverkampf, with the dedication Dem Andenken der im großen Kriege gefallenen deutschen Helden (To the memory of the German heroes who fell in the Great War). Simrock also published a vocal score as prepared by Reger himself.The Hebbel Requiem was first performed, together with Der Einsiedler, in Heidelberg on 16 July 1916, after the composer's death, as part of a memorial concert for Reger, featuring Eva Katharina Lissmann, the choirs Bachverein and Akademischer Gesangverein, and the enlarged Städtisches Orchester (Municipal Orchestra), conducted by Philipp Wolfrum.In 1925 the Requiem was published in Vienna as a pocket score, Philharmonia-Taschenpartitur No. 284. Edition Peters published it in 1928, stating the performance duration as 25 minutes, although the duration implied by the metronome marking is 14 minutes.
Johannes