In 1913 William Butler Yeats studied poetry with Ezra Pound, and from this date all his verse was based on real life. He was made a Senator in the new Irish Free State in 1922 and received a Nobel Prize for poetry in 1923 - so what caused his sudden depression and despair in 1925? His poetry from just after his marriage to George reveals his secret affair with a young Catholic girl from 1918 and the birth of their illegitimate son in 1920. But his...