He published in 1797 the important book Die Griechen and Romer, which was followed by the suggestive Geschichte der Poesie der Griechen and Romer (1798).
The Synagogale Poesie has been mentioned above.
The resident, Freytag, was not a very wise person (though he probably did not, as Voltaire would have it, spell "poesie" "poeshie"); constant references to Frederick were necessary; and the affair was prolonged so that Madame Denis had time to join her uncle.
Among his works of a more popular nature are La Poesie du moyen dge (1885 and 1895); Penseurs et poetes (1897); Poemes et legendes du moyen dge (1900); Francois Villon (Igor), an admirable monograph contributed to the "Grands Ecrivains Frangais" series; Legendes du moyen age (1903).
While much that Herder produced after settling in Weimar has little value, he wrote also some of his best works, among others his collection of popular poetry on which he had been engaged for many years, Stimmen der Volker in Liedern (1778-1779); his translation of the Spanish romances of the Cid (1805); his celebrated work on Hebrew poetry, Vom Geist der hebrdischen Poesie (1782-1783); and his opus magnum, the Ideen zur Philosophie der Geschichte der Menschheit (1784-1791).