The city's origins can be traced back into the 10th and 11th century, when three Slavic settlements existed on Wodzisław's present-day territory which eventually merged to form one town. In the course of the medieval eastward migration of Flemish and German settlers ("Ostsiedlung"), Wodzisław, as many other Polish settlements, was incorporated (granted city status and right) according to the so-called Magdeburg Law at some point before 1257 (the exact date remains unknown). This, however, is not to be confused with a change in national affiliation; Wodzisław continued to be part of the Kingdom of Poland, until Silesia as a whole became a fiefdom of the Bohemian crown in 1327. At that times of Duchess Constance, the town developed fast. Wodzisław was one of the most populated and richest towns of Upper Silesia. In 14 and 15th century the city continued to grow and developed into a regional trade centre. In the 15th century, the Hussites devastated the city. From 1526, Bohemia, including the fiefdom of Silesia, which Wodzisław was a part of, came under the authority of the Habsburg crown.