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In the years after his return from Bordeaux, Friedrich Hölderlin (1770-1843) completed some of his greatest poems but also, once they were finished, returned to them repeatedly, creating new and stranger versions sometimes in several layers on the same manuscript, which makes the editing of his works troublesome. Some of these later versions are fragmentary. He seems sometimes also to have considered the fragments, even with unfinished lines and incomplete sentence-structure, to be poems in themselves. This obsessive revising and his stand-alone fragments were once considered evidence of his mental disorder, but they were to prove very influential on later poets such as Paul Celan. In his years of madness, Hölderlin would occasionally pencil ingenuous rhymed quatrains which he would sign with fantastic names and give fictitious dates from previous or future centuries.