The Milion was the Golden Milestone in the centre of the city, close to the Basilica, the Hippodrome and Hagia Sophia, on which the distances to the important cities of the empire were inscribed. Built shortly after the foundation, it was restored in the time of Justinian and is last mentioned in 1268. According to the texts it was a tetrapylon, i. e. a square of four pillars connected by arches and covered by a domical vault.