The term "Greek Hellenistic" refers to the period of ancient Greek history that followed the conquests of Alexander the Great in the late 4th century BCE and lasted until the Roman conquest in the 1st century BCE. This era is characterized by the spread of Greek culture, language, and ideas across a vast territory, including parts of Egypt, Persia, and India. During the Hellenistic period, there was significant advancement in various fields such as art, science, and philosophy. Notable figures include Euclid in mathematics and Archimedes in engineering. The blending of Greek and local cultures led to the development of new artistic styles and intellectual movements.