In a Russification drive in the 1840s, Nicholas I prohibited use of the Belarusian language in public schools, campaigned against Belarusian publications and tried to pressure those who had converted to Catholicism under the Poles to reconvert to the Orthodox faith. In 1863, economic and cultural pressure exploded in a revolt, led by Konstanty Kalinowski (also known as Kastus). After the failed revolt, the Russian government reintroduced the use of Cyrillic to Belarusian in 1864 and no documents in Belarusian were permitted by the Russian government until 1905.