Name: Siddur
Description: The daily and Sabbath prayerbook is called the Siddur. The earliest version is that of Rav Amram Gaon of the 9th century C.E., containing all prayers for day to day observance. Siddurim vary from locale to locale and century to century, but are all based on the canonization of the liturgy by Rabbi Gamliel the Second, who lived in the 1st century C.E.