The church of St Petka of the Saddlers (15C) was built under the Ottoman occupation, thanks to donations from the region's master saddlers. At that time, the building of churches was tolerated provided that their height did not exceed that of a soldier on horseback, hence the half-buried sanctuaries. The church features a small semi-circular apse and superb traces of frescoes (it is possible to make out three layers of 15C, 17C and 19C paintings). It is also the resting place of the revolutionary leader Vasil Levski, hanged in Sofia in 1873.