Puzzle 101 - Knights and knaves

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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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