Basilides of Tyre
Basilides of Tyre was a mathematician , mentioned by Hypsicles in his prefatory letter of Euclid's "Elements" , Book XIV . 
<triplet> Basilides of Tyre <subj> mathematician <obj> occupation <subj> Euclid's "Elements" <obj> present in work <triplet> Hypsicles <subj> mathematician <obj> occupation