In what feilds did hippocrates and euclid make their greatest achievements?

Hippocrates is often regarded as the "Father of Medicine," making significant contributions to the field of medicine, particularly in establishing a systematic approach to clinical observation and ethics through the Hippocratic Corpus. Euclid, known as the "Father of Geometry," made his greatest achievements in mathematics, particularly through his work "Elements," which systematically compiled and organized the knowledge of geometry in a logical framework that has influenced mathematics for centuries.