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|Region||Principality of Catalonia, Kingdom of Valencia, Balearic islands, Alghero|
|Era||evolved into Modern Catalan by the 16th century|
Old Catalan (catala, romanz; Modern Catalan català antic) was the Romance language spoken in territories that spanned roughly the territories of the Principality of Catalonia, the Kingdom of Valencia, the Balearic Islands, and the city of Alghero in Sardinia; all of them then part of the Crown of Aragon.
Old Catalan was constantly changing and evolving. However, the form in the 13th and 14th centuries, as attested in the four great chronicles, can be considered standard. The writing system at this time was more phonetic than that used nowadays. In particular, all final consonants were pronounced. The phonological system can be summarised as follows:
It is believed that old Catalan had two lateral palatal phonemes. The first, /ʎ/, was noted with ⟨ll⟩, and has remained unchanged until nowadays. The second, reconstructed as /jl/, came from the Latin groups C'L, G'L, LE, LI; and was noted with ⟨yl⟩ or ⟨il⟩. /jl/ never appeared in initial position. This second phoneme has either merged with /ʎ/ in most dialects, or with /j/ in dialects with iodització.
Around the 12th century, word-initial /l/ became /ʎ/, even though it continued to be spelled as ⟨l⟩ until the 15th century.
The system features a modification of the original Proto-Romance /e/ and /ɛ/. First, /e/ was centralized to /ǝ/, and then, /ɛ/ was raised to /e/. In modern central Catalan, stressed /ǝ/ has been fronted to /ɛ/, thus inverting the original Proto-Romance distribution, still found in Italian or Portuguese. Balearic varieties still keep stressed /ǝ/.
It is assumed that during the preliterary period all the Catalan dialects featured a weak realization of the pretonic vowels. Around the 13th century, pretonic /a/ and /e/ began to be confused in writing in the Eastern dialaects. In these dialects, the confusion would be spread to all unstressed instances of /a/ and /e/, a process that was almost complete by the 15 th century.
Current Catalan ortography is mostly based on medieval practise, however, some of the ponunciations and conventions have changed.
- Accents and tremas were rarely used.
- ⟨c⟩ in front of e, i; ⟨ç⟩ and ⟨z⟩ were realized as /ts/, instead of modern /s/ or /z/. Modern ⟨ts⟩ was rarely used.
- ⟨-ch⟩ at the end of the word was used for /k/, instead of modern ⟨c⟩. This convention was kept until the early 20th century.
- E.g. modern amic was witten amich ("friend")
- ⟨yl⟩, ⟨il⟩, were used for the phoneme /jl/. In the modern language, the sound has come to be pronounced /ʎ/ or /j/ depending of the dialect. Both are written as ⟨ll⟩.
- E.g. modern mirall was witten mirail or mirayl ("mirror"). Cf. Latin miraculus.
- Initial /ʎ-/ (appeared in 12th century from /l-/) was noted as ⟨l-⟩ until the 15th century to keep the Latin etymology. In the modern language, it is noted as ⟨ll-⟩.
- E.g. modern llibre was witten libre ("book"). Cf. Latin liber.
- ⟨h⟩ was rarely used. Etymological Latin silent /h/ was usually not represented.
- E.g. modern haver was witten aver ("to have"). Cf. Latin habere.
- ⟨h⟩ was sometimes used to mark hiatus.
- E.g. modern veí was witten vehi ("neighbor")
- Final unvoiced obstruents were always written as such. In the modern language, the characters for their voiced counterparts may be used to reflect Latin etymology.
- E.g. modern fred was witten fret ("cold"). Cf. Latin frigidus.
See also 
- Rasico, Phillip (1982). Estudis sobre la fonologia del català preliterari. Curial/Publicacions de l’Abadia de Montserrat. p. 194.
- Moll 1993, p. 93.
- Recasens 1991, p. 196.
- Rasico, Phillip D. Entorn d'una llei fonètica catalana observada fa temps. p. 9.
- Coromines, Joan. "Vides de Sants" rosselloneses (in Catalan). p. 295. "A l'Edat Mitjana, les abundoses confusions ortogràfiques dels manuscrits demostren que el fet ja estava consumat des d'una data primerenca, pel que fa a la posicio pretònica; en final absoluta sovintegen menys les confusions de a amb e si bé no constitueixen una raresa; en síl·laba posttònica interna, i en la final quan segueix consonant, no es troben confusions abans del segle XV si no es en textos sospitosos i molt excepcionalment."