Sena and Guttika were two Tamil chiefs from South India who invaded the kingdom of Anuradhapura and killed King Suratissa. They reigned from 237 BC to 215 BC.They were two traders who came to Sri Lanka for selling horses.But they killed Surathissa, the king of Anuradhapura and ruled the kingdom for 22 years.King Asela defeated them and took the kingdom back.