i heard Viharamaha Devi was pregnant to a monk who was killed in hot oil tank by Kalani Tissa . and Vihara Devi was expelled from Kalaniya kindom , then she was found and married by Kawan Tissa , later he found out DUTUGAMUNU was illegitimate child and start discriminating , kingship was given to his legitimate child Sadda Tissa , is this true