One of the three younger brothers of Sena I, the others being Mahinda and Udaya (Cv.l.6). Kassapa was appointed Ādipāda and fought valiantly against the forces of the Paṇḍu king, who was then invading Sri Lanka, but, finding his efforts of no avail, he fled to Kondivāta (Cv.vv.25 ff). He was later killed at Pulatthipura by the orders of the Paṇḍu king (Cv.vv.46). He had four sons, the eldest of whom was named Sena (Cv.vv.47).