Schiltberger next accompanied Chekre, a Tatar prince living in Abu Bekr's horde, on an excursion to Siberia, of which name Schiltberger gives us the first clear mention in west European literature. He also probably followed his new master in his attack on the Old Bulgaria of the middle Volga, answering to the modern Kazan and its neighborhood. Wanderings in the steppe lands of south-east Russia; visits to Sarai, the old capital of the Kipchak Khanate on the lower Volga and to Azov or Tana, still a trading centre for Venetian and Genoese merchants; a fresh change of servitude on Chekre's ruin; travels in the Crimea, Circassia, Abkhazia and Mingrelia; and finally escape (from the neighborhood of Batum) followed.