Roman Catholic Diocese of Helena 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, Idaho, and Montana. Before becoming a diocese, this was the Vicariate of Montana (covering the whole territory and then state of Montana). For its first twenty years, the diocese served all of Montana. In 1904 the new Diocese of Great Falls-Billings
Mausoleum of Helena decorated with war scenes, as it was probably originally to be used for Helena's son, the emperor Constantine. Mausoleum of Helena The Mausoleum of Helena is an ancient building in Rome, Italy, located on the Via Casilina, corresponding to the 3rd mile of the ancient Via Labicana. It was built by the Roman emperor Constantine I between 326 and 330, originally as a tomb for himself, but later assigned to his mother, Helena, who died in 330. The area where the mausoleum is located is part of a late-Roman complex of building known as "Ad Duas Lauros", which, according to