From 1912 to 1914 Hellingrath lived and taught in Paris, during which time he began work on his monumental first-ever "Complete Edition" of Hölderlin, Hölderlins Samtliche Werke, collecting together not only all the poems in their variant forms, the novel Hyperion, the unfinished drama The Death of Empedocles, the articles and translations, but also all traceable letters and written accounts of the poet.
Hellingrath's project during his time in Paris (1912-1914) was a comprehensive "Complete Edition" of Hölderlin's works, encompassing all poems, novel, unfinished drama, articles and translations, as well as any letters or written accounts related to the poet.