This seems to be a question for myth busters. The point is that the claimant that I press will become my vassal. Everywhere I search for an answer people are answering differently.
- The claimant should not gain a higher title then yours.
To me this means I can vassal an entire kingdom if I am emperor or a county if I'm a duke by just inviting someone with a claim to my court and press his claim in a war. He will become my vassal and my land spreads
- You should land the claimant a higher title then he can gain
In this case you can only do this as a king (or perhaps petty king?) since as a duke I have to give away my title of duke in order to gain a county as a vassal. Likewise, this seems unwanted if I'm an emperor, as the emperor of 3 kingdoms I would not want to give away 1 kingdom in order to gain a duchy.
Even if I could gain a kingdom I would end up with a vassal holding as much kingdoms as I do making him extremely powerful.
How to
"Gain land by pressing claims of others" which is in the title. The problem is that there is no consistent or poor worded answers for this online so I want to know what is true by trying to explain clearly what is being said. Then yes, I give statements about them in case someone can explain it more clear and since I cannot post another question since this is Q&A.