Answer:
The answer is "I send you three grey cats with gifts, Queen Guinevere, To warn you, sleekly, silently."
Step-by-step explanation:
In the “The King Sends Three Cats to Guinevere" by Marjorie Allen Seiffert (1885-1970) the poet dwells on the theme of the Guinevere's infidelity. Here we have the phrase "to warn you" which indicates that Arthur knows of her betrayal .