'the riddle'

'I am no viper, yet I feed
On mother's flesh that did me breed.
I sought a husband, in which labour
I found that kindness of a father.
He's father, son and husband mild;
I mother, wife and yet his child.
How this may be, and yet in two,
As you will live, resolve it you.'

Pericles, late romances,
W. Shakespeare