Old English was first written in runes, using the futhorc – a rune set derived from the Germanic 24-character elder futhark, extended by five more runes used to represent Anglo-Saxon vowel sounds, and sometimes by several more additional characters. From around the 9th century, the runic system came to be supplanted by a (minuscule) half-uncial script of the Latin alphabet introduced by Irish Christian missionaries. This was replaced by insular script, a cursive and pointed version of the half-uncial script. This was used until the end of the 12th century when continental Carolingian minuscule (also known as Caroline) replaced the insular.