Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. WIjerd Jelckama was a Frisian military commander, warlord and member of the Arumer Zwarte Hoop ("Arumer Black Heap"). HE was the lieutenant of Pier Gerlofs Donia (also known as Grutte Pier) and fought along his side against the Saxon and Hollandic invaders. JElckama took Donia''s place as freedom fighter after Donia died in 1520. JElckama was born in the year 1490 in a large family of farmers and petty noblemen. HE was descended from knights who had participated in the Crusades. ONe of his ancestors from his father''s side of the family had died at the Siege of Antioch.