The Temporal Prime Directive is a Federation Starfleet principle that members of Starfleet should avoid directly interfering with the timeline in instances of time travel. (TNG: "A Matter of Time") The Romulans also had a version of the Temporal Prime Directive that prevented the RIS Bouteina to intervene against a Vo'Quv-class carrier in 2409. (RIS Bouteina: "Quantic Fissure")