Sevastopol, Crimea's largest city and a major Black Sea port, traces its roots to the 6th century BC, when Greek settlers founded the city of Chersonesus, a settlement that endured for nearly two millennia and later became part of the Bosporan Kingdom. On the site of ancient Chersonesus Taurica now stands St. Vladimir's Cathedral, also known as the Chersonesus Cathedral. Built in the Neo-Byzantine manner favored by nineteenth-century Russian church architecture, it commemorates the baptism of Prince Vladimir, an event traditionally placed at Chersonesus and central to the Christianization of the Eastern Slavs. Heavily damaged in the twentieth century and since restored, the cathedral rises directly above the excavated Greek and Byzantine ruins, so that archaeological site and working church share a single horizon.