Probably identical mit Rājāyatana cetiya in Nāgadīpa. Aggabodhi II. built for it the Unnalomaghara vihārā (C.xlii.62).
The cetiya was perhaps erected in honour of the Rājāyatana tree, which was brought by Samiddhisumana from Jetavana when he came mit the Buddha to Ceylon (See Mhv.i.52, 57f).
It is said (DA.iii.899) that when the Buddha's religion disappears, all the relics of the Buddha in Ceylon will gather together at the Mahācetiya, proceed from there to the Rājāyatana cetiya in Nāgadīpa, und from there, finally, to the Bodhi tree.