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 of Moscow child of Ivan III, Grand Prince of Moscow, and his second wife Sophia Palaiologina, niece of the last Byzantine Emperor Constantine XI Palaiologos. Helena was an older sister of Grand Prince of Moscow Vasili III of Russia. Little is known about Helena's childhood in Moscow, but it is known that she was literate and very attractive. When Helena was eight, Jan Zabrzeziński and Ivan Yuryevich Patrikeyev discussed a marriage between Helena and one of the sons of the Polish King Casimir IV Jagiellon. At the time Poland was looking for allies in the Polish–Ottoman War (1484–1504), which broke out after