It is well known that indigenous contemporary written documentation exists for the precolonial and early colonial history of some of the coastal societies of South-Eastern Nigeria. The best known example is Old Calabar, for which there exists most notably the diary of Antera Duke, covering the years 1785-88, a document brought from Old Calabar to Britain already during the nineteenth century. More recently John Latham has discovered additional material of a similar character still preserved locally in Old Calabar, principally the Black Davis House Book (containing material dating from the 1830s onwards), the papers of Coco Bassey (including diaries covering the years 1878-89), and the papers of E. O. Offiong (comprising trade ledgers, court records, and letter books relating to the period 1885-1907). In the Niger Delta S. J. S. Cookey, for his biography of King Jaja of Opobo, was able to use contemporary documents in Jaja's own papers, including correspondence from the late 1860s onwards. In the case of the neighboring community of Bonny (from which Jaja seceded to found Opobo after a civil war in 1869), while earlier historians have alluded to the existence of indigenous written documentation, they have done so only in very general terms and without any indication of the quantity or nature of this material.