William Palmer (1811-1879) was a theologian and ecumenist best known for his attempts to forge links between the Anglican and Orthodox churches. Palmer was elected a fellow at Magdalen College, Oxford in 1832, and became an adherent of the Oxford Movement, which emphasised the catholicity of the Anglican church. In the 1840s and 1850s Palmer visited Russia with the controversial aim of studying Orthodox theology and being admitted to communion by the Russian church. His request was refused, however, and his visit deemed a failure. Palmer converted to Roman Catholicism in 1855. Testimonies Concerning the Patriarch Nicon, the Tsar and the Boyars (1873) is Volume 2 of The Patriarch and the Tsar (1871-1876), Palmer’s six-volume translation of documents relating to the life of Nicon (1605-1681), Patriarch of Moscow, whose theological reforms brought him into conflict with the Muscovite Tsar Alexis.