The actual work of evangelising Ava and Pegu began under the pontificate of Innocent XIII who, in 1722, sent Father Sigismond de Calchi, a Barnabite, and Father Vittoni, of the same order, to Burma. After many trials and tribulations they succeeded in obtaining permission to preach with full liberty the Gospel of Christ. In 1741, Benedict XIV definitely established the mission, appointing Father Galizia Vicar Apostolic, and placing the Barnabites in charge of the work. The best-known of the Barnabites was Father Sangermano, who worked in Ava and Rangoon from 1783 to 1808; his "A description of the Burmese Empire" was first published in 1833.