caisléan Definitions (by source) Show all Trí Bior-Ghaoithe an Bháis: The Three Shafts of Death m., castle, 1068; gen. –léin, 1073 Trí Bior-Ghaoithe an Bháis: The Three Shafts of Death. Author: Geoffrey Keating. Editor: Osborn Bergin.