Zvornik and Visoko have become Dubronik's most developed settlements (colonies) in medieval Bosnia in the first half of the 15th century, which had a positive effect on their economic activating. These tho towns were then the largest centers for trading in Bosnia. On the gathering of Dubrovnik citizens, especially their traders and artisans, in Zvornik favorable influence had vicinity of Srebrenica and its silver mine, so in 1425 there were 238 Dubrovnik citizens in the town.