Across
1
Government ruled by a king or queen
5
Roman arena fighter
6
Metal that replaced bronze in tools
9
Armed entry into another territory
10
Sudden overthrow of a government
11
Ancient empire that conquered much of Europe
Down
2
Long and distinct period of history
3
Fundamental law of a nation
4
Formal agreement between nations
7
Belonging to a very old period
8
Military blockade of a fortified place
12
Armed conflict between nations