 In June 1850, Oblate missioner Alexandre-Antonin Taché was named coadjutor bishop to Provencher, whom he succeeded upon Provencher's death in July 1853.The following year, the name of the diocese was changed from that of the Diocese of the North West to the Diocese of Saint-Boniface.On April 8, 1862 the Apostolic Vicariate of Athabaska Mackenzie was erected from territory split off from the Diocese of Saint-Boniface.