Koceľ (9.th century) - was Prince of the Principality of Blatno (around 861 - 876), the son of Prince Pribina of Nitra. He actively participated in the development of Blatno while his father was alive, he succeeded his father on Prince Pribina's death. Originally, he was a vassal of a Frank king, but around 869 he united with Great Moravia and he strengthened its national and Christian independence. He was a supporter and protector of Slavonic writings (Frizínske manuscripts), and played an important role in the development of Christianity. He delayed Constantine-Cyril and Method in Panonia in 867, on their return...