Roman Catholic Diocese of Helena was formed to serve eastern Montana. The seat of the diocese is in the Cathedral of St. Helena in the state capital of Helena. It was completed in 1914. The bishops of the Diocese of Helena and their years of service: Roman Catholic Diocese of Helena The Diocese of Helena () is the Catholic diocese for western Montana with its cathedral located in Helena, the state capital. The diocese was erected from the year-old Vicarate of Montana on March 7, 1884, while Montana was still a territory. The diocese is a suffragan of the Archdiocese of Portland, which encompasses Oregon,
Helena Historic District (Helena, Montana) lasted 30 years and Helena became the state capital. The city grew from south to north along Last Chance Gulch, its main street, and hence the evolution of architectural styles can be traced. At the southern end the road is narrow with small log and stone buildings and at the northern end the road is wider and has large stonework homes. Few major downtown buildings were built in the years immediately after the Panic of 1893, which among other problems, caused the closing of the local silver mines. This resulted in downtown Helena having a sharp division in its older