Haring Harinxma was a powerful Frisian

Frisians

The Frisians are a Germanic ethnic group native to the coastal parts of the Netherlands and Germany. They are concentrated in the Dutch provinces of Friesland and Groningen and, in Germany, East Frisia and North Frisia, that was a part of Denmark until 1864. They inhabit an area known as Frisia...

 chieftain and Schieringer

Vetkopers and Schieringers

The Schieringers and Vetkopers were two opposing Frisian factional parties from the medieval period. They were responsible for a bloody civil war that lasted for over a century and which eventually led to the end of the highly praised "Frisian freedom".These factional parties arose because of an...

 who lived during the 13th and early 14th centuries. Haring also used the surname Donia, and is considered the patriarch of this well known Frisian family. Another title used by Haring was thoe Heeg meaning 'of Heeg', where he was born and lived.

The Schieringers

Vetkopers and Schieringers

The Schieringers and Vetkopers were two opposing Frisian factional parties from the medieval period. They were responsible for a bloody civil war that lasted for over a century and which eventually led to the end of the highly praised "Frisian freedom".These factional parties arose because of an...

 elected him potestate of Westergo (southwest corner of Friesland, modern Wymbritseradeel), together with Sjoerd Wiarda

Sjoerd Wiarda

Sjoerd Pijbes Wiarda was the fifteenth potestaat of Friesland now a province of the Netherlands.Sjoerd Wiarda born in 1355 and died in 1410. He was the son of Pybe Wyarda and Claer van Eminga. He lived on Wiarda estate at Goutum...

, van Gotum of Oostergo (eastern region of Friesland) in the struggle against the count of Holland in 1399. The appointment of Potestates aligned with the Schieringers

Vetkopers and Schieringers

The Schieringers and Vetkopers were two opposing Frisian factional parties from the medieval period. They were responsible for a bloody civil war that lasted for over a century and which eventually led to the end of the highly praised "Frisian freedom".These factional parties arose because of an...

 lead to renewed factionalism between the Vetkopers and Schieringers

Vetkopers and Schieringers

The Schieringers and Vetkopers were two opposing Frisian factional parties from the medieval period. They were responsible for a bloody civil war that lasted for over a century and which eventually led to the end of the highly praised "Frisian freedom".These factional parties arose because of an...

.

Seventeen 'Landsheeren' (sovereign lords) or Potestates served Friesland

Friesland

Friesland is a province in the north of the Netherlands and part of the ancient region of Frisia.Until the end of 1996, the province bore Friesland as its official name. In 1997 this Dutch name lost its official status to the Frisian Fryslân...

, from Magnus Forteman

Magnus Forteman

Magnus Forteman , was the first potestaat and commander of Friesland which is now a province of Netherlands...

 in 809 until the last, Juw Dekama, van Baard in 1494.

Continued 'bloody' factionalism between the Schieringers

Vetkopers and Schieringers

The Schieringers and Vetkopers were two opposing Frisian factional parties from the medieval period. They were responsible for a bloody civil war that lasted for over a century and which eventually led to the end of the highly praised "Frisian freedom".These factional parties arose because of an...

 and the Vetkopers

Vetkopers and Schieringers

The Schieringers and Vetkopers were two opposing Frisian factional parties from the medieval period. They were responsible for a bloody civil war that lasted for over a century and which eventually led to the end of the highly praised "Frisian freedom".These factional parties arose because of an...

 finally resulted in the Holy Roman Emperor, Maximilian I

Maximilian I, Holy Roman Emperor

Maximilian I , the son of Frederick III, Holy Roman Emperor and Eleanor of Portugal, was King of the Romans from 1486 and Holy Roman Emperor from 1493 until his death, though he was never in fact crowned by the Pope, the journey to Rome always being too risky...

, installing Albert, Duke of Saxony

Albert, Duke of Saxony

Albert III was a Duke of Saxony. He was nicknamed Albert the Bold or Albert the Courageous and founded the Albertine line of the House of Wettin....

 (b. 1443) as hereditary governor of Friesland in 1498.

The Monk/Historian Petrus Thaborita

Petrus Thaborita

Petrus Jacobi Thaborita was a Frisian monk, historian and writer. He is best known for his writings on the Frisian freedom fighter Pier Gerlofs Donia, and for writing down Donia's last words...

 writes in 1500 about "Haghe Haringfma", who was a Commander ("houeling"). A famous descedendent of Harinxma was the Frisian freedom fighter Pier Gerlofs Donia

Pier Gerlofs Donia

Pier Gerlofs Donia was a Frisian warrior, pirate, and rebel. He is best known by his West Frisian nickname "Grutte Pier" , or by the Dutch translations "Grote Pier" and "Lange Pier", or, in Latin, "Pierius Magnus", which referred to his legendary size and strength. His life is mostly shrouded in...

.