Glagolitic script alphabets, Cyril decided to invent a new script, Glagolitic, which he based on the local dialect of the Slavic tribes from the Byzantine theme of Thessalonica. After the deaths of Cyril and Methodius, the Glagolitic alphabet ceased to be used in Moravia, but their students continued to propagate it in the First Bulgarian Empire, where it was subsequently also displaced by the Cyrillic alphabet. The Glagolitic alphabet was preserved only by the clergy of Croatia to write Church Slavonic until the early 19th century. The name was not created until many centuries after the script's creation, and comes from the
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