In 1963, the Territorial Abbey of Ndanda handed over their former mission territory to the newly erected Mtwara diocese. The agreement between the missionary Benedictines and leadership of the diocese stated that “the missionary priests of the Congregation of St. Ottilien are prepared to co-operate with the African clergy in the ordinary and extraordinary pastoration under the authority of the Bishop. The Missionary brothers will also continue their services for the Diocese.” This forth volume of Ndanda’s widespread history describes the transition period which started under the Abbot Bishop Victor Haelg and continued under Abbot Siegfried Hertlein.