Assertion: dagger | /r/PartOf | tyrion lannister
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Source sentences:
text: This is actually what sets off the rift between the Starks and the Lannisters, since Lord Petyr "Littlefinger" Baelish tells Catelyn that the dagger (a Valyrian steel dagger aka the "catspaw's blade") belongs to Tyrion Lannister (who actually lost it in a bet and has nothing to do with hiring the assassin).