Code:
Event 9007
Base MTTH 2000
both provinces have same religion 0,3
both provinces have the same ruler 0,5
Target province has
grand palace 0,8
theater 0,8
school 0,9
university 0,9
royal post 0,9
church 1,1
large church 1,1
domed church 1,1
cathedral 1,1
templar house 1,2
monastery 1,2
thieves guild 1,2
smugglers ring 1,2
highway robber band 1,2
civilian harbour/road net0,9
extensive road net 0,9
naval harbour 0,9
grand shipyard 0,9
inquisition 1,4
vernacular_literature 1,2
academic_disciplines 0,9
international_fairs 0,9
foreign_accreditation 0,9
bubonic_plague 1,5
pneumonic_plague 1,5
malaria 1,5
dysentery 1,5
small pox 1,5
thyphoid 1,5
struggling 1,2
poor 0,9
prosperous 1,1
rich 1,2
revolt 0,8
looted 0,5
is a capital and ruler is independent 0,5
stability +1 0,9
stability +2 0,9
stability +3 0,9
stability 0 1,1
stability -1 1,1
stability -2 1,1
stability -3 1,1
Starting province has
civilian harbour/road net 0,9
extensive road net 0,9
naval harbour 0,9
grand shipyard 0,9
bubonic_plague 1,5
pneumonic_plague 1,5
malaria 1,5
dysentery 1,5
small pox 1,5
thyphoid 1,5
looted 1,2
struggling 1,2
poor 1,1
prosperous 0,9
rich 0,8
revolt 1,1
is a capital and ruler is independent 0,8
Laws of the target province
royal_preorgatory_law 0,8
traditional_custom_law 1,1
popular_law 1,2
regal supremacy 0,95
church supremacy 1,05
monastic_supremacy 1,05
Ruler of the target province has
merciful 0,9
just 0,9
energetic 0,9
cruel 1,2
arbitrary 1,1
lazy 1,1
stewardship 8 to 10 0,9
stewardship 11 to 13 0,9
stewardship 14 or higher 0,9
stewardship 4 to 6 1,1
stewardship 2 to 3 1,1
stewardship 1 or lower 1,1
intrigue 8 to 10 0,9
intrigue 11 to 13 0,9
intrigue 14 or higher 0,9
intrigue 4 to 6 1,1
intrigue 2 to 3 1,1
intrigue 1 or lower 1,1
prestige 1000 to 9999 0,9
prestige 10000 to 99999 0,9
prestige 100000 or higher 0,9
Class power in target province
burgher power 0,35 or higher 0,9
burgher power 0,45 or higher 0,9
burgher power 0,55 or higher 0,9
burgher power lower than 0,15 1,1
burgher power lower than 0,05 1,1
noble power 0,35 or higher 0,9
noble power 0,45 or higher 0,9
noble power 0,55 or higher 0,9
noble power lower than 0,15 1,1
noble power lower than 0,05 1,1
peasant power 0,45 or higher 1,1
peasant power 0,55 or higher 1,1
clergy power 0,55 or higher 1,1
peasant power lower than 0,05 0,9
clergy power lower than 0,05 0,9
Terrain of target province
desert 1,25
forest 1,1
hills 1,25
mountain 1,5
march 1,5
Era
Before 1100 1,1
Between 1300 and 1399 0,9
1400 or later 0,9
And here a map with trade-routes, which is handy for seeing which provinces are connected with each other. So that culture can spread even though there is no common border.