Eleazar Ben Killir

Eleazar ben Killir (c. 570 – c. 640) was a Hebrew poet whose classical liturgical verses, known as piyut, have continued to be sung through the centuries during significant religious services, including those on Tisha B'Av and on the sabbath after a wedding. He 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.