Terminus post quem
From Wikipedia, the free encyclopedia
Terminus post quem and the related terminus ante quem are terms used to give an approximate date for a text. Terminus post quem is used to indicate the earliest point in time when the text may have been written, while Terminus ante quem signifies the latest date at which a text may have been written.
[edit] In historical or archaeological studies
Terminus ante quem refers to the date before which an artifact or feature must have been deposited. Used with Terminus post quem ("limit after which"), similarly, teminus ad quem ("limit to which") may also refer to the latest possible date of a non-punctual event (period, era, etc.), while terminus a quo ("limit from which") may refer to the earliest such date.
For example an archaeological find of a burial may contain coins dating to 1588, 1595 and others less securely dated to 1590-1625. The terminus post quem would be the latest date from the evidence, the coin that may have only reached circulation in 1625. The burial can only be shown to be 1625 or later, although it may have actually been dug in 1595.
An archaeological example of a terminus ante quem would be deposits formed before or beneath a historically dateable event, such as a building foundation partly demolished to make way for the city wall known to be built in 650. It may have been demolished in 650, 649 or an unspecified time before - all that can be said from the evidence is that it happened before that event.
