"Kir'Shara" is the ninth episode of the fourth season of the American science fiction television series Star Trek: Enterprise. It was writer Michael Sussman's third episode of the season, while it was director David Livingston's second. The episode was the third in a three-part story arc, following on from the episodes "The Forge" and "Awakening". The title "Kir'Shara" refers to a Vulcan religious relic, and the three part Vulcan story arc explored themes relating to the Protestant Reformation resulting in comparisons to books such as The Da Vinci Code and The Celestine Prophecy, while the Kir'Shara itself was compared to the Nag Hammadi library.