This inscription is engraved on the wall of a cave at Habässa, the site of an ancient monastery in the forest on the right bank of the Kum̆bukkan Oya, about six miles south-east of the village called Okkampiṭiya in the Buttala Kōraḷē of the Ūva Province. At this site are two long and narrow hummocks of gneiss rock running north-west to south-east. Both have steep overhanging sides, forming a number of caves with drip-ledges. The cave containing the present inscription is one of three caves situated at the southern extremity of the southern range of rock.
The inscription can be dated on the basis of the script and language to the second century A.D. It records the grant of an irrigation channel and three fields to the ancient monastery of Ulibikala-Naka-maha-vihara by the uparāja Naka (Nāga), grandson of King Vahaba (Vasabha) and son of King Utara (Uttara). No king named Uttara is mentioned in the chronicles of Sri Lanka, hence this inscription is of great historical importance as a record of his existence. As his son, Nāga, is described here as a grandson of King Vasabha (r. 66–110 A.D.), it is clear that Uttara was either a son or a son-in-law of the latter – probably a son, since royal genealogies from this period tend to trace the descent directly on the paternal side. The Mahāvaṁsa and the other chronicles mention only one son of Vasabha, namely Vaṁkanāsika Tissa (Tissa the Crooked-Nosed), who succeeded him as king. ‘Uttara’ may, therefore, have been another name of Tissa but it is equally possible that certain historical facts were omitted from the chronicles and that Vasabha did, in fact, have another son who became king.
The present inscription was probably engraved during the reign of Tissa’s son and successor, Gajabāhu I. However, it is noteworthy that the donor of this inscription – an individual called Nāga, who is described here as holding the subordinate rank and office of uparāja – did not deem it necessary to mention the paramount sovereign of the day. In later medieval periods, the title uparāja was generally used by the heir-apparent and the same may be the case here. This conjecture finds support in the chronicles, which record that Gajabāhu’s successor was Mahallaka Nāga (‘Old’ Nāga), indicating that Tissa did have an heir called Nāga.