Titlepage

"His next public literary productions, Milton and Jerusalem, are dated 1804 on the engraved titlepages, but, largely on the evidence of the paper used in the only surviving copies, the usually accepted dates for these are about 1808 and 1820 respectively. It seems likely that Blake was engaged during much of the interim from 1795 to 1808 on Vala, though there has never been any definite evidence relating to its date other than the 1797 on the titlepage."