King's feast riddle

The king's feast riddle was the second riddle given to Lief by a pack of Granous.

Cavern of The Fear
After successfully completing his first riddle, the Granous pack leader presented Lief with this rhyme:

''A king dined with his sister,  His friend and his friend's wife.  All of them were greedy beasts''

Who loved food more than life.

At last three pies alone remained

There wasn't any knife.

How did they all have equal shares,

And save themselves from strife?

Lief was able to solve the riddle by guessing that the best friend's wife was also the king's sister, therefore there were enough pies for everyone.