In 1242 Prussia was sectioned into four bishoprics under the archbishop of Riga Livonia by the
papal legate William of Modena. The four parts were called
Culmer Land (Kulmer Land, Kulmerland,Pomesania(Pomesanien),
Ermeland or Warmia (German Ermland) and Samland (Latin Sambia). Culm (Kulm) and Thorn at the Vistula river and north of the Drewenz river were at the border to Masovia.