Egyptian is the oldest known language of Egypt and a branch of the Afroasiatic language family. The earliest known complete sentence in the Egyptian language has been dated to about 2690 BC, making it one of the oldest recorded languages known, along with Sumerian. Egyptian was spoken until the late 17th century AD in the form of Coptic. The national language of modern-day Egypt is Egyptian Arabic, which gradually replaced Coptic as the language of daily life in the centuries after the Muslim conquest of Egypt. Coptic is still used as the liturgical language of the Coptic Church. It has several hundred fluent speakers today.