For a long time I use a sheet to work up revenues and troop strength whenever I needed to know that information. I developed it in the early nineties starting with various Harn materials including Battlelust, Harnmanor, and Shorkyne.
To use the worksheet you need to supply the number of manor/estates for each major settlement. The number of urban households, and the sheet calculates the rest. You can also enter the land quality if you like. 1.0 represents average fertile soil. Lower numbers represent poor soils. Higher numbers better soils. Insert a row in the settlement portion of the sheet to add more settlements.
My general philosophy is to try to use real world units and concepts as much as possible. But use the law of averages to make something that is usable especially for something large as a entire realms.
The current limitation of the worksheet is that it is oriented towards feudal societies and would look very different in a imperial society, viking, etc. Especially in the military section. I still haven't settled in my mind how to deal with those types of societies yet.
Feudal Domains Worksheet
Money Assumptions
All revenue is given in silver pennies
One silver penny is equal to one D&D silver piece
One silver penny is equal $4 of GURPS money
One gold crown is equal to 320 silver penny
d is the symbol for 1 silver penny
Population Assumptions
Each Manor averages 1,500 acres
City Household are always entered by referee
Towns average 500 urban households
Castles average 100 urban households
Keeps average 50 urban households
One Rural Household per 50 acres
Revenue Assumptions
Each Urban Household averages 100d of revenue
Each Rural Household generate 1/4d of revenue
Each Rural Manor generates 1d per acre of revenue
Note this is the monies paid to the liege and represents net income NOT gross income.
Different cultures will divide the net income in different ways. The worksheet provides the base numbers to work with.
Military Assumptions
One yeoman per 900 acres of land
12% of urban household has yeoman training
A further 1 in 6 urban households has militia training
Every manor provides a knight fee
60% of Knight fee will be given in person
40% of Knight fee will be given in scutage (money)
Levies serve three months
A Knight Fee is worth one of the following
2400d
1 Knight
5 Yeoman 10% of knight's fee will send 5 yeoman instead of a knight
Knight's Affinty
A Knight Affinty is his retinue of men
50% of knights will have a heavy horse
the rest will have a medium horse
1/3 of knight bring a squire
25% of Squires of a knight with a heavy horse will have a heavy horse
the rest will have a medium horse
10% of the knights will bring an average of 1.5 yeoman (1 to 2)
Yeoman Breakdown
Medium Foot 20%
Light Foot 45%
Unarmored LongBow 5%
Light LongBow 10%
Unarmoured ShortBow 10%
Light ShortBow 10%
The general yeomanry is raised separately from the call up of knights.
The costs are support costs
The levy may be supplemented with paid troops
The levy may be supplemented with the militia however this threatens the harvest
Mercenaries use the Yeoman Chart
Support costs are broken out to show the minimum needed to keep an army in the field.
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