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Roughly 400 known ogham inscriptions are on stone monuments scattered around the Irish Sea, the bulk of them dating to the fifth and sixth centuries. Their language is predominantly Primitive Irish, but a few examples record fragments of the Pictish language. Ogham itself is an Early Medieval form of alphabet or cipher, sometimes known as the "Celtic Tree Alphabet".


Ballaqueeney Ogham Stone from the Isle of Man showing the droim in centre. Text reads: BIVAIDONAS MAQI MUCOI CUNAVA[LI] ᚁᚔᚃᚐᚔᚇᚑᚅᚐᚄ ᚋᚐᚊᚔ ᚋᚒᚉᚑᚔ ᚉᚒᚅᚐᚃᚐ[ᚂᚔ], or in English: Bivaidonas, son of the tribe Cunava

Map of Ireland, Isle of Man and Britain; black dots mark Ogham inscriptions.
A number of different numbering schemes are used. The most widespread is CIIC, after R. A. S. Macalister (Corpus Inscriptionum Insularum Celticarum, Latin for "corpus of Insular Celtic inscriptions"). This covers the inscriptions known by the 1940s. Another numbering scheme is that of the Celtic Inscribed Stones Project, CISP, based on the location of the stones; for example CIIC 1 = CISP INCHA/1. Macalister's (1945) numbers run from 1 to 507, including also Latin and Runic inscriptions, with three additional added in 1949. Ziegler lists 344 Gaelic ogham inscriptions known to Macalister (Ireland and Isle of Man), and seven additional inscriptions discovered later.

The inscriptions may be divided into "orthodox" and "scholastic" specimens. "Orthodox" inscriptions date to the Primitive Irish period, and record a name of an individual, either as a cenotaph or tombstone, or documenting land ownership. "Scholastic" inscriptions date from the medieval Old Irish period up to modern times.

The vast bulk of the surviving ogham inscriptions stretch in arc from County Kerry (especially Corcu Duibne) in the south of Ireland across to Dyfed in south Wales. The remainder are mostly in south-eastern Ireland, eastern and northern Scotland, the Isle of Man, and England around the Devon/Cornwall border. The vast majority of the inscriptions consists of personal names, probably of the person commemorated by the monument.

The Rosetta Stone is a granodiorite stele inscribed with three versions of a decree issued in Memphis, Egypt, in 196 BC during the Ptolemaic dynasty on behalf of King Ptolemy V Epiphanes. The top and middle texts are in Ancient Egyptian using hieroglyphic and Demotic scripts respectively, while the bottom is in Ancient Greek. The decree has only minor differences between the three versions, making the Rosetta Stone key to deciphering the Egyptian scripts.

Granodiorite
Writing
Ancient Egyptian hieroglyphs, Demotic script, and Greek script
Created
196 BC
Discovered
1799
Discovered by
Pierre-François Bouchard
Present location
British Museum
The stone was carved during the Hellenistic period and is believed to have originally been displayed within a temple, possibly at nearby Sais. It was probably moved in late antiquity or during the Mameluk period, and was eventually used as building material in the construction of Fort Julien near the town of Rashid (Rosetta) in the Nile Delta. It was discovered there in July 1799 by French officer Pierre-François Bouchard during the Napoleonic campaign in Egypt. It was the first Ancient Egyptian bilingual text recovered in modern times, and it aroused widespread public interest with its potential to decipher this previously untranslated hieroglyphic script. Lithographic copies and plaster casts soon began circulating among European museums and scholars. When the British defeated the French they took the stone to London under the Capitulation of Alexandria in 1801. It has been on public display at the British Museum almost continuously since 1802 and is the most visited object there.

Study of the decree was already underway when the first complete translation of the Greek text was published in 1803. Jean-François Champollion announced the transliteration of the Egyptian scripts in Paris in 1822; it took longer still before scholars were able to read Ancient Egyptian inscriptions and literature confidently. Major advances in the decoding were recognition that the stone offered three versions of the same text (1799); that the demotic text used phonetic characters to spell foreign names (1802); that the hieroglyphic text did so as well, and had pervasive similarities to the demotic (1814); and that phonetic characters were also used to spell native Egyptian words (1822–1824).

Three other fragmentary copies of the same decree were discovered later, and several similar Egyptian bilingual or trilingual inscriptions are now known, including three slightly earlier Ptolemaic decrees: the Decree of Alexandria in 243 BC, the Decree of Canopus in 238 BC, and the Memphis decree of Ptolemy IV, c. 218 BC. The Rosetta Stone is no longer unique, but it was the essential key to the modern understanding of ancient Egyptian literature and civilisation. The term 'Rosetta Stone' is now used to refer to the essential clue to a new field of knowledge.