<P> Crowther began translating the Bible into the Yoruba language and compiling a Yoruba dictionary . In 1843, a grammar book which he started working on during the Niger expedition was published; and a Yoruba version of the Anglican Book of Common Prayer followed later . Crowther also compiled A vocabulary of the Yoruba language, including a large number of local proverbs, published in London in 1852 . He also began codifying other languages . Following the British Niger Expeditions of 1854 and 1857, Crowther, assisted by a young Igbo interpreter named Simon Jonas, produced a primer for the Igbo language in 1857, another for the Nupe language in 1860, and a full grammar and vocabulary of Nupe in 1864 . </P> <P> In 1864, Crowther was ordained as the first African bishop of the Anglican Church; he was consecrated a bishop on St Peter's day 1864, by Charles Longley, Archbishop of Canterbury at Canterbury Cathedral . He later received the degree of Doctor of Divinity from the University of Oxford . </P> <P> Crowther was on the island of Madeira in the Atlantic Ocean west of Morocco for a conference . He was accompanied by his son, Dandeson, an archdeacon, on church business in March 1881 . </P> <P> Crowther's attention was directed more and more to languages other than Yoruba, but he continued to supervise the translation of the Yoruba Bible (Bibeli Mimọ), which was completed in the mid-1880s, a few years before his death . </P>

Who was the slave boy who later became a bishop