Ibn al-Adami
The 11th-century historian Sa'id al-Andalusi informs us that the theory of trepidation that became known to Europe and was ascribed to Thabit ibn Qurra can be found instead in the Zij of Ibn al-Adami , who himself may have known of this theory from Thabit's grandon , Ibrahim ibn Sinan . 
<triplet> Ibrahim ibn Sinan <subj> Thabit ibn Qurra <obj> relative