It is a biographical poem book. Heine had dared to enlist it in the service of airy phantasy, delicate humor and sparkling wit. During the summer of 1830, while he was loitering at Helgoland, he was roused to feverish excitement by the news of the July Revolution. He inveighed against the nobility in a preface to a pamphlet, called Kahldorf on the Nobility, which largely increased the number of his powerful enemies. The literary censorship had long mutilated his prose writings, besides materially diminishing his legitimate income by prohibiting the sale of many of his works. He now began to fear that his personal liberty would be restricted as summarily as his literary activity; and in May, 1831, he took up his residence in Paris.