Roman Catholic Diocese of Lutsk  The Roman Catholic diocese of Lutsk was first erected in the 13th century as the diocese of Luceoria o Łuck. After the victory of Napoleon, the diocese was united with the diocese of Zytomir and Zytomirsk, into the diocese of Lutzk, Zhitomir and Kamenetz. Finally, in 1925, the diocese of Lutsk was restored and the Diocese of Zytomir was split off.