5 Lest worse betide you by some later chance.

betide > befall chance > chance, accident (Occasion)

6 But read how are you named, and of what kin."

read > make known, declare

7 "Phedon I hight," quoth he, "and do advance

hight > am called advance > boast of, lay claim to

8 My ancestry from famous Coradin,

Coradin > "Uncontrollable Spirit" (Latin cor, heart; Greek adunateo, to lack strength or spirit)

9 Who first to raise our house to honour did begin."

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