Тема: Euclid of Alexandria

...the education he was receiving in philosophy in Alexandria so, while still a teenager, he moved from Alexandria to Athens where he studied at...
Proclus wrote Commentary on Euclid which is our principal source about the early history of Greek...

It is highly likely that, when he was a young man, Archimedes studied with the successors of Euclid in Alexandria .

We only know details of the Handy Tables through the commentary by Theon of Alexandria but in the author shows that care is required since Theon was not fully aware of Ptolemy's procedures.