The Temporal Prime Directive, known as General Order 157, is a principle of Starfleet and the Federation Department of Temporal Investigations that was introduced in 2268, requiring non-interference with the timeline in cases of time travel and temporal displacement. (TNG episode: A Matter of Time)

When Kira Nerys was sent back to the year 2377, despite no longer being a Starfleet captain she decided to still follow the Temporal Prime Directive. (DS9 novel: Sacraments of Fire)

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