The king wanted to choose the smartest and bravest son-in-law for his daughter  Like all the suitors, he declared that he had locked the princess and the two lions into three houses respectively, and then wrote a sentence on the doors of the three houses to let the suitors open the doors they thought they could open  The door of the first room said there are lions in this house and the door of the second room said The princess is in the first room
the door of the third room reads there is a lion in this house
Three houses are filled with lions.