Knudsen was the son of Frederik Thomas Knudsen and Annelis Johanne Marie Lie. After finishing his training as a painter and lithograph at the Bergen Academy of Art and Design, he happened on a missionary festival on a hike through the Rhineland, thereupon taking on his missionary calling. He joined the Rhenish Missionary Society in Elberfeld-Barmen in 1836, and upon completing his training at the missionary institute was dispatched in 1841 to South West Africa to further the work of Heinrich Schmelen, who had been based at what is now Bethanie, Namibia.
In South Africa
After a short sojourn with Schmelen in Komaggas in Namaqualand, Knudsen took his post in Bethanie in November 1842. Successful from the beginning at preaching to the localNama people, he baptized most converts in a few months and in 1847 boasted a congregation of 760. Though he still needed an interpreter to communicate in Nama, he built enough rapport to be trusted with codifying tribal laws previously held in oral tradition to reduce arbitrary caprices in their execution. The resulting code was adopted as tribal law in October 1848. The Nama in Berseba and Rehoboth adopted the same code with amendments. Although some provisions proved unworkable, the core of the legal corpus remains in force today and provided a foundation for agreement among the three subtribes based in the above towns and for further cultural development.
In South West Africa
Knudsen traveled through the tribal territories around Bethanie and Berseba, writing their observations in diaries and reports. Although photography was unheard of in South Africa at the time, Knudsen drew and painted portraits of distinguished chieftains, scenes of village life, and ordinary Herero in Windhoek. He was the first European artist based in South West Africa. Save for a few examples, his works were published in the mission magazine and are currently displayed in the mission archives. The only works of his remaining in Southern Africa are two portraits of Khoikhoi at Stellenbosch University. Knudsen's diaries attest to his already studying in depth the language and customs of the Nama, Damara, and San peoples. His findings conflict with those of the explorer Sir James Edward Alexander, especially in the 1844-1845 entries where he claims the Nama to be descended from the Ten Lost Tribes of Israel. The poor attendance and transient lifestyle of his original parishioners concerned Knudsen; however, the Oorlam Nama under chief Paul Goliath eagerly recruited his ministry and he established the mission of Gudbrandsdalen to serve them in an area that reminded him of his childhood home in the eponymous region. Knudsen rebuilt in 1842 the stone cottage Schmelen had built in Bethanie in 1814 to reside until his 1834 departure, which had been razed in the interim. Still known as the Schmelen House, it has long been considered the oldest stone building in existence and the second ever built by Europeans on Namibian soil. The first, built by Wesleyan missionaries in 1806 in Warmbad, was destroyed by Jager Afrikaner, father of Jonker Afrikaner.
Travel to Europe and marriage
Knudsen took leave to Europe in June 1847, presenting on his work at missionary festivals and ultimately publishing Gross-Namaqualand. On a visit to Bergen, he married Elise Christiansen.
On his return to Bethanie in 1849, he found his congregation abandoning Christianity and joining the raids of Jonker Afrikaner against the Herero. Boycotting the raids in protest, he was banished by the chief of Bethanie. Bitterly disappointed, Knudsen roamed around missions in the Northern Cape, ending up in Tulbagh in 1852. Struggling to adapt and coping with his wife becoming mentally ill, he left the ministry in 1854 and returned to Norway. There, his wife died in an asylum and made a meager living as an itinerant preacher, dying on a winter mountain hike. His two sons were adopted and raised by family.
Writings
Knudsen's first publication was Nama A.B.Z. kannis, a short book of prayers and readings with a glossary, English translation, and part of the catechism, the Ten Commandments, and other parts of the Holy Scriptures. Around the same time, he published an alphabet of sorts in the Nama language. Copies of both appear in the Grey collection in the National Library of South AfricaCape Town campus, complete with Knudsen's handwritten notes. The same collection includes his handwritten Südafrica: Das Hottentot-Volk: Notizzen, Stoff zu einer Grammatik in der Namaquasprache, and Namaquasprache. These cover the geography and ethnography of Great Namaqualand as well as Khoekhoe syntax. Knudsen's translation of the Gospel of Luke and the two aforementioned Cape Town publications were key sources for RMS Inspector J.C. Wallmann's Vocabular der Namaqua Sprache nebst einem Abrise der Formenlehre derselben. His Gospel of Luke in Khoekhoe was published in Cape Town with some hymns in 1846 after a few productive years of learning the language with the help of two Nama translators. Though slightly proofread on spelling from the earlier publications, Wallmann's copy was rendered so meticulously that it was virtually free of printing errors, and Wilhelm Bleek described it in 1858 as "so far the best and most reliable source on ". Though somewhat rigid, it rendered idioms accurately. Ironically, chief David Christiaan Goliath and the local congregational school forbade pupils from being educated in their mother tongue, opting instead to teach inDutch, the language of the local white settlers and the Oorlam.
Assessment
He was a refined, sensitive artist and a born researcher. Though he tirelessly spread the faith to his nomadic parishioners at great difficulty, he was so temperamental and impulsive that he could not cope with the disappointments life sent his way. He lacked the practical austerity of the classic pioneer missionary in some ways, therefore.
