There is a place called the Island of Knights and Knaves, where knights always tell the truth and knaves always lie and every inhabitant is either a knight or a knave. On this particular island, each woman is either a constant liar or a constant truth teller. The men are as usual—knights and knaves. In this island, I was introduced to three married couples—the Arks, the Bogs, and the Cogs. One of the three couples is the king and queen of the island. I was reliably informed that in none of the couples are both of them liars. They all made the following statements: Mr. Ark: I am not the king. Mrs. Ark: The king was born in Italy. Mr. Bog: Mr. Ark is not the king. Mrs. Bog: The king was really born in Spain. Mr. Cog: I am not the king. Mrs. Cog: Mr. Bog is the king. Who is really the king? You can find the solution here.
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