Input (grade 13): From 1515 to 1523, the Habsburg government in the Netherlands also had to contend with the Frisian peasant rebellion, led first by Pier Gerlofs Donia and then by his nephew Wijerd Jelckama.
Output (grade 11): In the 16th century the Holy Roman Empire (HRE) had to deal with the rebellion of the Frisians lead by Pier Gerlofs Donia and Wijerd Jelckama.