Be it known, therefore, to your sacred majesty, that in the year 1253, on the 7th of May, we entered into the sea of Pontus, which the Bulgarians call the Great Sea[1]; which I was informed, by certain merchants, is 1008 miles in length, and is in a manner divided, about its middle, into two parts, by means of two provinces which project into it, one on the north, and the other on the south. That which is on the south is called Synope, and contains the castle and port of the Sultan of the Turks. The northern province is called Gasaria by the Latins[2], and Cassaria by the Greek inhabitants of its coast, which is the same with Caesaria; and from thence certain headlands extend southwards into the sea, towards Synope, from the nearest part of which they are 300 miles distant; so that the distance from these points to Constantinople is 700 miles in length and breadth, and 700 miles to Hiberia in the east, which is a province of Georgia. We arrived in the province of Gasaria, or Casaria, which is of a triangular form, having a city named Kersova on its western extremity, in which St Clement suffered martyrdom. While sailing past that city, we saw an island containing a church, which is said to have been built by the angels. In the middle of this province, and on a cape to the south, stands the city of Soldaia, directly facing Synope. And here all merchants land who come from Turkey, in their way to the north, and embark here again on their return from Russia and the north for Turkey; these latter bring ermines and martins, and other valuable furs, and the former carry cloths made of cotton, or bombasins, and silk webs, and aromatic spices. On the east of this province is the city of Matriga[3], where the Tanais flows into the Pontus, by a mouth of twelve miles wide[4]. Before this river enters the Euxine, it forms itself into a sea towards the north, of seven hundred miles in length and breadth, but in no place above six paces deep, so that it is not navigable for large vessels: For which reason, the merchants of Constantinople, when they arrive at the city of Matriga, send their barks to the Tanais, where they purchase dried fish, sturgeons, thosas, barbels, and many other sorts of fish.