Eleazar ben Kalir was one of Judaism's earliest and most prolific of the paytanim, liturgical poets. Many of his hymns have found their way into festive prayers of the Ashkenazi Jews synagogal rite. In the acrostics of his hymns he usually signs his father's name, Kalir. Eleazar's name, home, and time have been the subject of many discussions in modern Jewish literature, and some legends concerning his career have been handed down. It is now assumed that he had lived in Kirjath-sepher in the Land of Israel (Rosh to Brochos Siman 21). His time has been set at different dates, from as early as the 6th century (basing the view on Saadiah's Sefer ha-galuy), to the end of the 10th century of the common era. Older authorities consider him to have been a teacher of the Mishnah and identify him either with Eleazar b. 'Arak or with Eleazar b. Simeon (See Ma'adanei Yom Tov to Brochos, ch. 5, gloss 5 where he discusses whether he was the son of Rashbi or another Rabbi Shimon). He has been confounded with another poet by the name of Eleazar b. Jacob; and a book by the title of "Kebod Adonai" was ascribed to him by Botarel.