On 13 February 1841, the same pope transferred the see from Bardstown to Louisville, changing the title of the diocese to Diocese of Louisville and designating St. Louis Church in Louisville as its new cathedral. However, Bishop Flaget determined that the diocese needed a new cathedral in 1849 and started construction of the Cathedral of the Assumption, but died on 11 February 1850, a few months after laying the cornerstone, leaving it to his successor, Bishop Martin John Spalding, to complete the construction. Bishop Spalding dedicated the new cathedral on 3 October 1852. The new cathedral was built around St. Louis Cathedral, which was then disassembled and carried piece by piece out the doors of the larger structure.