Ritske Jelmera was a Frisian chieftain born in 1383 in Ternaard, Friesland who ruled the island of Ameland. He died in 1450 (testated January 17, 1450). His stins (stone house) stood near Ballum. His descendants through his great-grandson Pieter went by the family name of Cammingha. Sources and references Burmania, Upcke van, Frisicae nobilitatis genealogia, Rijksarchief Friesland, Leeuwarden, Van Eysinga-Vegelin van Claerbergen Family Archive, inventory no. 1323b. Verhoeven, G., J.A. Mol, and H. Bremer, Friese Testamenten tot 1550, Leeuwarden: Fryske Akademy, 1994. 1383 births 1450 deaths Medieval West Frisians People from Ameland People from Dongeradeel 15th-century people of the Holy Roman Empire