Your VP - or Victory Points - are shown at the top left of the screen and are an indicator of your Kingdom's strength. They are earned by capturing other players' Lands or attacking their Cities, and is also generated by some Lands.    

But beware - if another player captures one of your lands or successfully attacks your city, they'll steal some of your VP, so make sure you keep your Kingdom well defended by placing Titans on your Lands and Garrison.