""Rusia" or "Ruthenia"" appears in the 1520 Latin treatise "Mores, leges et ritus omnium gentium, per Ioannem Boëmum, Aubanum, Teutonicum ex multis clarissimis rerum scriptoribus collecti" by Johann Boemus. In the chapter "De Rusia sive Ruthenia, et recentibus Rusianorum moribus" ("About Rus', or Ruthenia, and modern customs of the Rus'"), Boemus tells of a country extending from the Baltic Sea to the Caspian Sea and from the Don River to the northern ocean. It is a source of beeswax, its forests harbor many animals with valuable fur, and the capital city Moscow ("Moscovia"), named after the Moskva River ("Moscum amnem"), is 14 miles in circumference.