2) Leon. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...in 1230. 2. A city of central Mexico east-northeast of Guadalajara. It was founded in the 1570s and today is a commercial and industrial center in a rich mining area....

3) 1569-71. 2001. The Encyclopedia of World History
...had financed imperialist ventures in Europe by borrowing on future imports of silver, which in 1570s and 1580s created false sense of endless wealth. Decline in silver...