This command changes the owner of a specified province to the specified country. If no country tag is specified, the country you are currently playing as will become the owner of the specified province.
own [province id] [country tag]
|Province ID||The ID of the province you wish to change the owner of.|
|Country Tag||The tag of the country you wish to make the owner of the specified province.|
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Mewar's province ID is 2058. This command would make the country you are currently playing as become the owner of Mewar.
own 2058 POL
As we have specified Poland's country tag, this command would make Poland the owner of the province with ID 2058 (Mewar).