SultanAhmet's second Byzantine church is found down in the twisting streets and wooden buildings below the Hippodrome. Head south, downhill toward the sea, for the Küçük Haghia Sophia Mosque, or 'Little Haghia Sophia', so called because of its resemblance to Justinian's great cathedral. Like its larger namesake, it was originally a church, in this case dedicated to Sergius and Bacchus, the patron saints of the Christianised Roman army. Also like its namesake, it's not much to look at from the outside but possesses a fine interior, including a frieze honouring Justinian and his wife, Theodora. There's also a pleasant garden with an attached cafe.