The Summons of the Lord of Hosts is a collection of the six Tablets of Baháʼu'lláh, written in 1868–1870 to the rulers of the world at the time of His exile in Adrianople and Akka. Recipients included Napoleon III of France, Czar Alexander II of Russia, Queen Victoria of England, Nasiri’d-Din Shah of Persia, and Pope Pius IX.