Cyril, to facilitate his preaching to the Slavs, invented, with some help from Methodius, the Glagolitic script which used some letters from Hebrew and Greek cursive writing to accurately capture the unique sounds of the Slavic language. The brothers had created the script before they even left home (the Slavic language having no written form previously) and used it to make translations of the liturgy of John Chrysostomos (Bishop of Constantinople from 398 to 404 CE), the Psalms of the Old Testament and the Gospels of the New Testament. They traveled to Great Moravia to promote it. They enjoyed considerable success in this endeavour. However, they came into conflict with German ecclesiastics who opposed their efforts to create a specifically Slavic liturgy.