or Rostow, a large town of the Russian empire, and capital of a territory of the same name, with an archbishop's see, seated on the lake Cotteri, in E. Long. 40. 25. N. Lat. 57. 5. The duchy of Rostoff is bounded on the north by Jaroslav, on the east by Sutdal, on the south by the duchy of Moscow, and on the west by that of Tver.