Uludağ Polihron (Cyril) Monastery
Polihron Monastery is one of the most important of the Uludağ monasteries, as it is the monastery where St. Cyril (Cyrillos), the inventor of the alphabet used by the Slavs today, and his brother Methodius (Methodios) lived and produced this alphabet. There are no ruins of this monastery that can be identified today.

The place where Saints Cyril and Methodius, the pioneers of the Cyrillic alphabet, invented the Glagolitic alphabet, is known as the Polihron Monastery. LX. According to the learned clergyman Chernorizets Hrabir, who lived at the end of the 10th century and the beginning of the 10th century, St. Cyril revealed the Slavic-Bulgarian alphabet with his studies in the Uludağ Polihron Monastery.

Osman Şevki Bey located the Cyril Monastery at an altitude of 430 meters in the south of Cumalikızık and Fidyekızik villages.