Across
1
Formal agreement between nations
4
Fortified medieval residence
5
Sudden overthrow of a government
8
Belonging to a very old period
11
Ancient Mesoamerican civilization
Down
2
Metal that replaced bronze in tools
3
Union formed for mutual benefit
6
Period of one hundred years
7
Ancient Egyptian ruler
9
Ancient empire that conquered much of Europe
10
Relating to the Middle Ages
12
Succession of rulers from same family