The location of Londinium's original cathedral is uncertain. The present structure of St Peter upon Cornhill was designed by Christopher Wren following the Great Fire in 1666 but it stands upon the highest point in the area of old Londinium and medieval legends tied it to the city's earliest Christian community. In 1995, however, a large and ornate 4th-century church was discovered on Tower Hill, which seems to have mimicked St Ambrose's cathedral in the imperial capital at Milan on a still-larger scale. This possible cathedral was built between 350 and 400 out of stone taken from other buildings, including its veneer of black marble. It was burnt down in the early 5th century.