The king's servants, who belonged to the Lambakarna dynasty (an ancient clan of Sri Lanka), were very arrogant.
The Mahavamsa states that he built a dagoba near the Tissa Lake and used Lambakarnas to dig stones and tread clay for it, and deployed Chandalas as their acting officers.
He then invaded Anuradhapura, fought against the treacherous Lambakarna dynasty, defeated them and regained the kingship.
The Mahavamsa states that King Ilanaga brutally avenged his treacherous Lambakarnas and killed them.
But nevertheless, the power of the Lambakannas would continue to grow, and prince Vasabha, a member of this clan would eventually end the House of Vijaya in 65 A.D.