|Birth||19th of Tyelcartel, 677 AEKE|
27th of Ujeregula, 718 AEKE|
41 in Artograchian years,
42 in Terran years (at the time of death)
|Children||Brelon of Brevia|
Zylf Tondbertling (Etrandish: Zylf Tondbertling ; IPA: [zʏłf‿tʰɔndbəɹtl̥ɪŋ]) was an Etrandish prince, younger brother of King Calder I of Etrand, and one of the participants of the Etrandish Succession War of 718 on the usurper/rebel side (together with his brothers Kerlon and Symner). He was also the father of Brelon of Brevia. He was killed by his own men during the Battle of Morshu's Mill, after he ordered them to assassinate his brother Kerlon.