Saeculum
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A saeculum is a length of time roughly equal to the lifetime of a person. The term was first used by the Etruscans. Originally it meant the period of time from the moment that something happened (for example the founding of a city) until the point in time that all people who had lived at the first moment had died. At that point a new saeculum would start. According to legend the Gods had accorded a certain amount of saecula to every people or civilization, the Etruscans themselves for example had been given ten saecula.
At the time of the reign of emperor Caesar Augustus the Romans decided that a saeculum was 110 years. In 17 BC Caesar Augustus organised Ludi saeculares ('century-games') for the first time to celebrate the 'fifth saeculum of Rome'. By the second century B.C., Roman historians were using the saeculum to periodize their chronicles and track wars. Later emperors like Claudius and Septimius Severus have celebrated the passing of saecula with games at irregular intervals. In 248, Philip the Arab combined Ludi saeculares with the 1000th anniversary of the founding of Rome 'ab urbe condita'. The new millennium that Rome entered was called the 'Saeculum Novum', a term that got a metaphysical connotation in Christianity, referring to the worldy age (hence 'secular').
A saeculum isn't normally used for a fixed amount of time, in common usage it stands for about 90 years. It can be divided into four "seasons" of approximately 22 years each; these seasons represent youth, rising adulthood, midlife, and old age.