Demographic trends in western Europe facilitated this “colonization.” The settlers—confident of personal liberty, preset rents, and a few measure of self-administration and working under the so-known as German Legislation—Established new villages and cities or reorganized old ones. Towns gained official charters (Wrocław in 1242, Poznań in 1253, Kraków in 1257) https://polawede.tumblr.com/