Centuries ago refers to events or things that happened or existed a very long time ago. This phrase can be replaced by several other synonyms such as eons ago, aeons past, days of yore, antiquity or time immemorial. Each of these terms' gives a different sense of time, where eons past is interpreted as a universe's setting, while time immemorial is understood as a timeline before history was properly documented. The phrase days of yore indicates a period from a previous age that is looked back on with a certain nostalgia. Antiquity implies something old and ancient, referring more to historical artifacts and structures.