The History of the Decline and Fall of the Roman Empire by Edward Gibbon in seven slipcased volumes

Classic history, presented in seven volumes, each in its own slipcase. 

Vol I: The Turn of the Tide

Vol II: Constantine and the Christian Empire

Vol III: The Revival and Collapse of Paganism

Vol IV: The End of the Western Empire

Vol V: Justinian and Roman Law

Vol VI: Mohammed and the Rise of the Arabs

Vol VII: The Normans in Italy and the Crusades