No hint of the existence of this poet was evident until Menahem Zulay discovered his poetry some forty years ago among remnants of the Cairo Geniza MSS. Because his work consists of weekly liturgical compositions written in accordance with the triennial cycle followed in Palestine in ancient times and because Byzantium is the ruling government mentioned in his poetry, Zulay considered him to be Yannai's “mate.” As shown in this study Simeon must indeed have known Yannai's work and even followed his example. However, Simeon himself introduced some structural developments in the form of the ‘Amidah composition known as Qedushta. Most interesting is the fifth poem in his Qedushta to Gen. 44:18 on the theme of Joseph and his brothers. In his dramatic exposition he even outdoes that of Yannai, his master, intended for the same week. A full critical edition of Simeon's poetry based on about fifty Geniza MSS which is now in print (Israel Academy of Sciences and Humanities) will be of importance for a better understanding of ancient Palestinian poetry and spiritual life. His poems are of great significance also in that they contain the oldest known parallels to ancient Palestinian midrash literature.