Viard purchased land in
Thorndon and the Hutt Valley. In Thorndon (now Hill Street) the Marist lay brothers began building a clergy house and a convent for the sisters. A foundation stone was laid for
St Mary's Cathedral. Viard had a vast diocese and few clergy but was able to open missions or parishes in the Hutt Valley, Hawke's Bay and Nelson. The
Akaroa mission was reopened for a time but troubles with the
Canterbury Association caused its priests to leave. In 1852 the
Wanganui parish and mission were opened and after that there was virtually no Marist help given to Viard until 1859. In 1860 Viard was appointed first bishop of Wellington. Practical questions continued to tax him during the next decade. In 1861, noting the diminishing number of sisters in the Wellington convent, he invited Auckland Sisters of Mercy to come to Wellington. He also brought French sisters from the Institute of Our Lady of the Missions to
Napier,
Christchurch and
Nelson. With the arrival of new groups of Marists he was able to establish priests in
New Plymouth and Christchurch in 1860, and in
Marlborough in 1864. During these years he remained keenly disappointed that he did not have the resources to support adequately the
Māori missions. The Taranaki wars also interfered for a time with the expansion of Māori work. A new phase of activity was precipitated by the gold rushes in Otago and Westland. From 1861 Viard kept a Marist at Dunedin permanently, and during the 1860s was able to send more priests to Invercargill and the
Otago diggings. The miners of the Otago and West Coast diggings helped Viard build up his depleted finances. He visited Otago and Canterbury in 1864 and the northern part of the South Island and Westland in 1866. In Westland, Irish priests followed the thousands of Irish miners and their families to the diggings, and parishes were established at
Greymouth,
Hokitika,
Kumara,
Ngahere,
Charleston,
Ross,
Westport and
Reefton. Viard was greatly embarrassed when it was revealed that several Irish priests were active
Fenian supporters, and he spoke out against their activities in 1868. ==Final years and death==