Ptolemy can refer to several historical figures, concepts, or entities, depending on the context. Here are a few prominent references: 1. **Claudius Ptolemy**: A Greek-Roman mathematician, astronomer, geographer, and astrologer who lived in the 2nd century AD in Alexandria, Egypt.
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Portrait of Ptolemy
. Unknown engraver, in André Thevet, Les vrais portraits et vies des hommes illustres (1584), folio 87; scan via UQAM. Public domain (PD-Art, life+100/pre-1931 publication). Source and usage information on the linked Wikimedia file page. Source.