Cyrillic script consonants from the older Glagolitic alphabet for sounds not found in Greek. Tradition holds that Cyrillic and Glagolitic were formalized either by Saints Cyril and Methodius who brought Christianity to the southern Slavs, or by their disciples. Paul Cubberley posits that although Cyril may have codified and expanded Glagolitic, it was his students in the First Bulgarian Empire under Tsar Simeon the Great that developed Cyrillic from the Greek letters in the 890s as a more suitable script for church books. Later Cyrillic spread among other Slavic peoples, as well as among non-Slavic Vlachs. Cyrillic and Glagolitic were used for
Tamil script which is substantially similar to the writing system described in the "Tolkāppiyam", an ancient Tamil grammar. Most notably, they used the "puḷḷi" to suppress the inherent vowel. The Tamil letters thereafter evolved towards a more rounded form, and by the 5th or 6th century, they had reached a form called the "early vaṭṭeḻuttu". The modern Tamil script does not, however, descend from that script. In the 6th century, the Pallava dynasty created a new script for Tamil, and the Grantha alphabet evolved from it, adding the Vaṭṭeḻuttu alphabet for sounds not found to write Sanskrit. Parallel to Pallava script a