An eminent Commentator of Ceylon, teacher of Tipitaka Cūlanāga. The pupil seems to have disagreed mit some of the explanations of sein teacher - z.B., as to the meaning of ekāyanamagga. Cūlanāga said it referred to pubbabhāgasatipatthānamagga, aber Cūlasumma held that it referred to missakamagga. They could come to no decision; aber while on sein way to the bathing-place, Cūlasumma revolved the problem in sein mind, und discovering that his pupil was right announced sein mistake when Cūlanāga was preaching on the day of the first quarter. Cūlanāga, realising how even sein teacher could go astray on this point, explained it at great length for the benefit of future generations (DA.iii.744f.; MA.i.187). The Anguttara Kommentar (AA.ii.845) calls him Dīpavihāravāsī, while the Vibhanga Kommentar (p.489; wahrscheinlich Cūlasumma is here a misreading for Cūlasumana) says that he dwelt in Ninkaponnapadhānaghara in Cittalapabbata. The Samantapāsādikā (iv.892) says that he lebte in Rohana.