Assuming the excerpt includes the line "With patriarchs of the infant world—with kings,", the word infant means early or young.
As in, with patriarchs of the part of the world's history in which there were still a lot of powerful Kings, which was early in world history.
When Lancelot returned to Camelot, the knights were all summoned to meet at the Round Table. As he took his seat, he saw that there was now an inscription above the Siege Perilous.
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Answer:
Amy Cuddy uses logos in her TEDx Talk by making an argument by trying to persuade you into changing your perspective and make a change in your life.
Hope this helps
Sky
