Buddhist Dictionary of Pali Proper Names by G P Malalasekera
Rāmāyana
Rāmāyana:Reference to this Epic Poem does not occur in the Pitaka or in the early books.
Even in the Commentaries reference thereto is rare (E.g.,DA.i.76; MA.i.163,as Sītāharana),and then it is only condemned as ”purposeless talk” (niratthakakathā).
Only in the later Chronicles,such as the Cūlavamasa (E.g.Cv.lxiv.42),is the work actually mentioned by name.See also Rāma (5).