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The Claudian letters were developed by the Roman emperor Claudius (reigned 41–54). He introduced three new letters to the Latin alphabet:

• Ↄ or /X (antisigma) to replace BS [bz] and PS [ps], much as X stood in for CS [ks] and GS [ɡz]. The shape of this letter is disputed, however, since no inscription bearing it has been found. Franz Bücheler identified it with the variant Roman numeral Ↄ, but 20th-century philologists, working from copies of Priscian's books, believe it to instead resemble two linked Cs (Ↄ+Ϲ), which was a preexisting variant of Greek sigma, and easily mistaken for X by later writers. Revilo P. Oliver argued that Claudius would have based this letter upon the Arcadian variant of psi or . This letter should not be confused with the "open O" letter. (Ɔ)
• Ⅎ, a turned F or digamma (digamma inversum) to be used instead of the letter V when denoting the consonantal phoneme [w] or [β]. Thus, it resembles the use of the letter V in modern Latin texts, where the vocalic use of the letter V is represented by its variant U, which has been recognized as a different letter only later.
• Ⱶ, a half H. The value of this letter is unclear, but it may have represented the so-called sonus medius, a short vowel sound (likely [ɨ] or [ʉ]) used before labial consonants in Latin words such as optumus and optimus. The letter was later used as a variant of [y] in inscriptions for short Greek upsilon (as in Olympicus). It may have disappeared because the sonus medius itself disappeared from spoken language.

Usage

These letters were used to a small extent on public inscriptions dating from Claudius' reign, but their use was abandoned after his death. Their forms were probably chosen to ease the transition, as they could be made from templates for existing letters. He may have been inspired by his ancestor Appius Claudius the Censor, who made earlier changes to the Latin alphabet. Claudius did indeed introduce his letters during his own term as censor (47–48), using arguments preserved in the historian Tacitus' account of his reign, although the original proclamation is no longer extant. Suetonius said of Claudius' letters:

Besides this he invented three new letters and added them to the alphabet, maintaining that they were greatly needed; he published a book on their theory when he was still in private life, and when he became emperor had no difficulty in bringing about their general use. These characters may still be seen in numerous books, in the registers, and in inscriptions on public buildings.

Support for the letters was added in version 5.0.0 of Unicode. Although these letters, as all Latin letters in antiquity, originally occurred only in capital form, lowercase forms were introduced to meet Unicode casing requirements. The minuscule form for the turned F was designed as a turned small capital F and should not be confused with the IPA symbol ɟ representing a voiced palatal stop.

The letters are encoded as follows:

See also

• Chinese characters of Empress Wu
• Reversed half H – Letter of the Latin alphabet

References

1. ^ Oliver, Revilo P. (1949). "The Claudian Letter Ⱶ". American Journal of Archaeology. 53 (3): 249–257. doi:10.2307/500662. JSTOR 500662. S2CID 193082268.
2. ^ Bücheler, Franz: De Ti. Claudio Caesare Grammatico at Google Books (Latin), Elberfeld (Germany) 1856
3. Tacitus, Annals 11:14
4. Ryan, F. X. (1993). "Some Observations on the Censorship of Claudius and Vitellius, A.D. 47–48". American Journal of Philology. 114 (4): 611–618. doi:10.2307/295428. JSTOR 295428.
5. Suetonius pass, Loeb Classical Library edition, 1913‑1914, English translation is by J. C. Rolfe. Page 77, paragraph 41. (From LacusCurtius)
6. ^ Michael Everson (2005-08-12). "Proposal to add Claudian Latin letters to the UCS" (PDF). Unicode Technical Committee, Document L2/05-193R2 = ISO/IEC JTC1/SC2/WG2, Document N2960R2. Retrieved 2021-12-27.

• Palaeographic letters
• Latin-script letters
• Claudius
• 1st-century introductions
• Latin epigraphy