Across
1
Medieval land-for-service system
4
Fortified medieval residence
5
Fundamental law of a nation
7
Belonging to a very old period
11
Person who travels to discover new lands
13
Sudden overthrow of a government
14
Military conflict or fight
15
Government by the people
Down
2
Period of ten years
3
Armed entry into another territory
6
Freedom from outside control
8
Payment made to show submission
9
Military blockade of a fortified place
10
Movement of people to new areas
12
Metal that replaced bronze in tools