Haring Harinxma (1323–1404) was a powerful Frisian chieftain and Schieringer 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. Seventeen 'Landsheeren' (sovereign lords) or Potestates served Friesland, from Magnus Forteman in 809 until the last, Juw Dekama, van Baard in 1494.