How old is the letter c?

How old is the letter c? During the 3rd century BC, a modified character was introduced for /ɡ/, and ‘ c’ itself was retained for /k/. The use of ‘ c’ (and its variant ‘ g’) replaced most usages of ‘ k’ and ‘ q’.

During the 3rd century BC, a modified character was introduced for /ɡ/, and ‘ c’ itself was retained for /k/. The use of ‘ c’ (and its variant ‘ g’) replaced most usages of ‘ k’ and ‘ q’.