In 1827, after Siestrzencewicz's death, the vicar capitular, Milucki, ruled the diocese for a short time. In 1828 Andreas Klagiewicz was appointed administrator; he was sent to the interior of Russia during the Insurrection of 1831, returned in 1832, was preconized Bishop of Vilnius in 1839 and took possession of the see on June 28, 1841. He died the same year, after witnessing the ruin of the Ruthenian Uniat Church in his diocese. The chapter elected John Cywinski as vicar suffragan; he saw the University of Vilnius closed, the clergy and churches of his diocese despoiled of their property. In 1848 he was succeeded by Wenceslaus Zylinski, who was transferred in 1856 to the metropolitan see of Mohilev, but continued to govern his former diocese until 1858.