The document discusses several contributions of ancient cultures including the Greeks, early Christians, Romans, and Irish to writing and Western civilization. The Greeks contributed democracy, the Olympic Games, philosophy, architecture, theatre styles, literary classics like the Iliad and Odyssey, and advances in sculpture and pottery. Early Christians preferred the codex format for sacred texts as it was more durable and portable than scrolls. The Romans added letters to the alphabet and introduced parchment, the codex format, roads, plumbing, aqueducts, the calendar, engineering, art, and literature including the Justinian Code. Irish monks further developed writing by introducing spaces between words and designing the Insular script to improve readability.