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
St. Cyril Peak St. Cyril Peak St. Cyril Peak (Vrah Sv. Kiril \'vr&h sve-'ti 'ki-ril\) rises to 1,505m in Friesland Ridge in Tangra Mountains on Livingston Island in the South Shetland Islands, Antarctica. The peak is linked to St. Methodius Peak to the southwest by Vladaya Saddle and surmounts Ruen Icefall to the west, Macy Glacier to the east and Prespa Glacier to the south. The peak is "named after St. Cyril (827-869 AD) who, together with St. Methodius, created the Glagolitic alphabet and translated the Holy Books into Bulgarian language". The peak is located at , which is 4.15 km south-southwest of