C, or c, is the third letter in the English and ISO basic Latin alphabets. Its name in English is cee (pronounced /ˈsiː/), plural cees.
When the Roman alphabet was introduced into Britain, ⟨c⟩ represented only /k/, and this value of the letter has been retained in loanwords to all the insular Celtic languages: in Welsh, Irish, Gaelic, ⟨c⟩ represents only /k/. The Old English Latin-based writing system was learned from the Celts, apparently of Ireland; hence ⟨c⟩ in Old English also originally represented /k/; the Modern English words kin, break, broken, thick, and seek all come from Old English words written with ⟨c⟩: cyn, brecan, brocen, þicc, and séoc. However, during the course of the Old English period, /k/ before front vowels (/e/ and /i/) were palatalized, having changed by the tenth century to [tʃ], though ⟨c⟩ was still used, as in cir(i)ce, wrecc(e)a. On the continent, meanwhile, a similar phonetic change had also been going on (for example, in Italian).