The following quatrain has been circulating on the Net, attributed to Nostradamus:

“In the City of Gold there will be a great thunder, Two brothers torn apart by Chaos, while the fortress endures, the great leader will succumb.  The third big war will begin when the big city is burning." 

This page says that the quatrain is bogus. 

Also try searching here to see for yourself that no such quatrain exists among Nostradamus’ writings.