Euclid can refer to several different concepts, depending on the context: 1. **Mathematician**: Euclid (circa 300 BC) was a Greek mathematician often referred to as the "Father of Geometry." He is best known for his work "The Elements," a comprehensive compilation of the knowledge of geometry of his time, which systematically presented definitions, postulates, propositions (theorems and problems), and proofs.
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Portrait of Euclid
. Later imagined depiction dated 1584, identified on Wikimedia Commons. This is not an authentic likeness from antiquity; Commons identifies the artwork as public domain. Source.
