Euclid Euclid Euclid (; – "Eukleídēs", ; fl. 300 BC), sometimes given the name Euclid of Alexandria to distinguish him from Euclides of Megara, was a Greek mathematician, often referred to as the "founder of geometry" or the "father of geometry". He was active in Alexandria during the reign of Ptolemy I (323–283 BC). His "Elements" is one of the most influential works in the history of mathematics, serving as the main textbook for teaching mathematics (especially geometry) from the time of its publication until the late 19th or early 20th century. In the "Elements", Euclid deduced the theorems of what
Ptolemaic cult of Alexander the Great who had succeeded to temporarily evict her son from Alexandria. As women could not occupy a supreme priesthood in the Greek world, she had to content herself with placing one of her supporters in the post, as a public sign of her new dominance. After Artemidorus, however, the name of Ptolemy IX was subsequently added in the papyrus, which means that he managed to return to Alexandria in the same year. In 107 BC, Cleopatra III managed to expel Ptolemy IX for good from Alexandria, and raised her second son, Ptolemy X, to the throne as her co-ruler and priest