The Greek alphabet, which is the earliest known script to systematically include both consonants and vowels, is generally believed to have added vowels when it was adapted from the Phoenician script during the late 9th or early 8th century BCE.

Sorry, that paragraph is AI written but I was asking about something I know and too lazy to rewrite it myself.

The Phoenician alphabet which influenced the greek script had 22 letters afaik. Still doesn't match the sides but it's closer