Wijerd Jelckama (also spelled Wierd and Wijard)[1][2] (c. 1490– 7 July 1523) 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 retired in 1519.[3]
^Eekhoff, W.(1851). Beknopte geschiedenis van Friesland (in Dutch). Leeuwarden: W. Eekhoff. 138–139.
^Kok, Jacobus (1791). "Pier Gerlofs Donia". Vaderlandsch Woordenboek (in Dutch). Vol. 24 (P-R). Amsterdam: Johannes Allart. pp. 17–21.
^Kok, Jacobus (1791). "Pier Gerlofs Donia". Vaderlandsch Woordenboek. Vol. 24 (P–R). Amsterdam: Johannes Allart. pp. 17–21.