Here is a true little Gothic cathedral. The beautiful Collegiate Church of St. Florentius (built between the 13th and 14th centuries) has been an important place of pilgrimage since 810. It houses the relics of St. Florentius, former Bishop of Strasbourg during the last third of the 6th century, who succeeded St. Arbogast and preceded St. Ansoald to the Episcopal See of Strasbourg.