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Yannai (יניי or ינאי‎) was an important payyetan who lived in the late fifth-early sixth century in the Galilee in Byzantine Palestine. Sometimes referred to as the "father of piyyut," his poetry marks the beginning of the Classical Period of piyyut that ranged from the fifth-eighth centuries. He was the first poet of piyyut to sign his name in an acrostic, to use end-rhyme, and to wrote for weekly services (not just for the High Holidays and particular festivals). According to Laura Lieber, the liturgical form most associated with Yannai is the qedushta, which embellishes the first 3 blessing of the Amidah (a part of the Jewish prayer service).