Rabbi ben Ezra is a poem by Robert Browning about Abraham ibn Ezra (1092-1167), one of the great poets, mathematicians and scholars of the 12th century. He wrote on grammar, astronomy, the astrolabe, etc.
The poem begins:
It is not a biography of Abraham ibn Ezra; like all of Browning's historical poems, it is a free interpretation of the idea that ibn Ezra's life and work suggests to Browning, theistic paradox, that good might lie in the inevitability of its absence:
The poem was published in Browning's Dramatis Personae in 1864.