The Diocese of León was founded on February 21, 1864, immediately after entering on duty their new bishop Monsignor José María de Jesús Diez de Sollano, the completion of this temple, which is popularly known as New Company and was established as set out cathedral. By then they were already concluded the vaults (1833-1837), the first body of the eastern tower (1864) was revamped, the largest bell weighing 4.5 tons was cast in the months of December 1865 and January 1866.
