As stated above in terms of the findings of the Archeologists the letters and geometrical signs found on the granite slabs and pottery pieces of Ibbankatuwa tomb and the paintings, symbols and geometrical lines found from excavations on the walls of caves and rock shelters. The engraving, scratching and the symbols and geometrical lines which have been used as communication of pre historical period have been gradually improved and in to the Brahmin letters and thereafter to the present Sinhala letters and language.
The evidence found in archeological items and the inscriptions from several parts of the island, it reflects that the Brahmin letters have been used from 2-3 centauries of B.C. to the 13th centaury of A.D.
Most of them are the granite inscriptions such as carvings on the caves below the drip ledge, on the granite pillars (‘tam lipi”), on the rock itself and slabs (“puwaru lipi”).
According to the chronicles of Sri Lanka, “Thripitaka” has been recorded on palm leaves by Buddhist monks in 1st centaury of B.C. during the period of King Walagambha in Alu Vihara temple of Mathale. It is a proof to say that Sinhalese had a developed written language even during that period.
Brahmi inscription found from Rajagala of Ampara (Said to be belonged to the period of 2nd centaury of B.C.)
Brahmi letters in Vessagiriya cave (Said to be belonged to the period of 3rd centaury of B.C.)
Golden Royal Charter of King Wasabha (said to be belonged to the period of A.D. 66-110)
Inscription of granite slab of King Gajaba of Ruwanweli Seya (This is on display at the national museum of Colombo)
5.”Tam lipi” ( Inscription on them reflects the figures of fan of Bhikkus, animals such as crows and dogs which are believed to be a massage to whom it has been misused will be punished in next birth as reflects there in.) This is on display at the national museum of Colombo.
The book inscriptions of golden plates found in Jethawanarama of Anuradhapura
(The language found in these is Sanskrit and the letters are in Sinhala)
7. The copper plates of the Royal Charter of King Vijayabahu (Said to be belonged to the period of A.D. 1055-1110 and this is on display at the national museum of Colombo.)
Writing on this is indicating that the chieftain Sitnaru Bim Budalna who has given shelter and the protection to the king and the royal family during the invasion of Chola have been gifted special privileges as a gratitude towards him.
Inscription of King Nissanakamalla at the Nissankamalla council of Polonnaruwa which is called as “Gal potha” (the stone book)
The oldest palm leave book and the tools and equipments used in inscription on olla leave are on display at the national museum of Colombo
11.Copper Royal Charter of King Kirthi Shri Rajasingha (said to be belonged to the period of A.D. 1747-1782)
1.Helayo-Hidden Histry-part 1 – by J.R.Manjula
2.The Prehistory of SL An Ecological Perspective –Port I II Dr. S.V. Deraniyage 1992- Department of Archaeology
3.The culture of Balangoda pre historic Inahabitnts discovered from Sabaragamuwa Dr. Shiran Deraniyagala 1998.6.15 souvenir in memory of 20th anniversary
4.The Prehistoric Civilization by Dr. Shiran Deraniyagala – – Our Cultural Inheritance – Vol 1-
5.Pre historic Civilization of Sri Lanka Transiated by Nimal Perera
Our Fore fathers lived prior to 100,000 years (Interview by Janaka Liyanarachchi- Divaina
7.Collection of granite inscription. Uduwara Jayantha, Department of Archeology 1983
Lithography of Sri Lanka, Senarath Wickramasigha, Department of National Museum
Places with historical values and monuments by Senior Lecturer of the University of Rajarata
New findings revealed from Dorawaka about the pre historical inhabitant, W.H. Wijepala, The Department of Archeology
Inscription of primitive style found from Sangamankanda of Ampara, National Conference of Archeology 2009 Vol. 1, and The Department of Archeology
The Art of Paintings, Thilakarathna Diganwala ,Wasana Publishers