Wikipedia: G

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The seventh letter in the latin alphabet, G, was created by the Romans because they felt that C was not an adequate letter to represent both /k/ AND /g/.
G, which at this time took the place of the letter Z, came to represent /g/. As /k/, /g/ too developed palatal and velar allophones which is the reason why today, G has different sound values in all Romance languages and English (due to French influence).

The seventh letter in the Roman alphabet, G, was created by the Romans because they felt that C was not an adequate letter to represent both /k/ AND /g/.
G, which at this time took the place of the letter Z, came to represent the sound /g/. As the sound /k/ did, /g/ also developed palatal? and velar? allophones which is the reason why today, G has different sound values in all Romance languages and English (due to French influence).

The seventh letter in the Roman alphabet, G, was created by the Romans because they felt that C was not an adequate letter to represent both /k/ AND /g/. G, which at this time took the place of the letter Z, came to represent the sound /g/. As the sound /k/ did, /g/ also developed palatal? and velar? allophones which is the reason why today, G has different sound values in all Romance languages and English (due to French influence).