What is saint constantine kos?

Saint Constantine Kose (also known as Saint Constantine the Philosopher or Saint Cyril) was a Byzantine Christian scholar and theologian who lived in the 9th century. He is best known for his work in developing the Cyrillic alphabet, which is still used today in many Slavic languages.

Constantine was born in Thessalonica in 826 and was the youngest of seven brothers. He studied in Constantinople and later moved to the Khazar Khaganate where he served as a missionary and a tutor to the ruling family. While in Khazaria, he developed the idea for the Cyrillic alphabet, which he based on the Greek alphabet.

He returned to Constantinople in 860, where he was appointed as a teacher at the patriarchal school. He worked alongside his brother Methodius to translate the Bible into Old Church Slavonic, a dialect that was widely spoken in the Slavic lands at the time.

Constantine and Methodius faced opposition from church officials who insisted that the Bible could only be translated into Latin or Greek. They appealed to Pope Adrian II, who supported their work and authorized the use of the Cyrillic alphabet in the translation of the Bible.

After Methodius' death, Constantine continued his work and was eventually appointed as the bishop of Moravia, where he served until his death in 869. He is remembered as a saint and is celebrated by the Eastern Orthodox Church on May 11th.