R. Abraham ben David Halevi Ibn Daud (Rabad I; c. 1110–1180) was a historian, philosopher, physician, and astronomer. Ibn Daud, the grandson of R. Isaac ben Baruch Albalia, was born in Cordoba, and spent his formative years in the home of his maternal uncle, R. Baruch b. Isaac Albalia who was his teacher. Though little is known of his life until 1160 it is evident from his writings that he received a well-rounded education, including rabbinics, Bible, Hebrew poetry, and Greek and Jewish philosophy. He was also familiar both with the N. T. and the Koran. In the wake of the Almohad conquest of Spain, he fled to Castile, where he settled in Toledo, the city with which he was most deeply associated, until his death there as a martyr in c. 1180.

המקור הערבי, בשם "אלעקידה אלרפיעה", אבד. התרגום העברי הוא של ר' שלמה בן לביא. עיין: שטיינשניידר, .H.U, עמ' 368-372.