English: Duchy of Teschen - feudal fragmentation around the year 1580:

black dotted line: borders in the early 16th century;
red d.l.: land in direct ducal possession, future Teschen Chamber;
dark green d.l.: Bielsko state country - future duchy of its own;
light green d.l.: Frydek-Mistek state country - the most Catholic and Czech part of the Cieszyn Silesia;
pink d.l.: Skoczów-Strumień state country - later reincorporated to the duchy/Teschen Chamber;
blue d.l.: Frysztat state country - in future very fragmented;

note: Bogumin was a state country of its own, but was not part of the Duchy of Teschen in the 16th century - the borders kind of differ with the textual description: for example in the text Brenna is part of Skoczów state country and Jasienica is part of the Bielsko state country, but not on the map;

map based on the Monography of Cieszyn Silesia from 2011, Volume III (1528-1653), p. 112, ISBN: 978-83-926929-5-9