Use "warrantor" in a sentence

1. And trembling a little she stretched her right hand towards the bones and said: “Kings of Logres and of Cornwall; my lords Gawain, and Kay, and Girflet, and all of you that are my warrantors, by these holy things and all the holy things of earth, I swear that no man has held me in his arms saving King Mark, my lord, and that poor pilgrim