He was appointed titular bishop of Mariamme in 1960, and served as Superior General of the Congregation of Marian Fathers from 1963 to 1969. He was also Apostolic Visitor for Belarusian Catholic faithful abroad.
Bishop Sipovich was a significant figure of the Belarusian émigré community in the United Kingdom.
Alexander Nadson '"Bishop Ceslaus Sipovic", Journal of Byelorussian Studies, 5:1.
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