Read the split before you conquer
Pause and open the succession tab before a war that would add a duchy or a kingdom. The tab lists the titles each child is lined up to receive. That list is the picture you change with grants.
The player heir receives the primary title and the capital county. The other children line up for titles outside that core when those titles exist. When the tab already gives a younger child a county inside your domain, grant them land outside the capital duchy before you take more.
The succession course explains when Confederate Partition can mint a same-rank title. This page focuses on the practical loop: read the succession tab, grant land outside the capital duchy, then read the tab again.
Grant the share while you are alive
Partition counts titles a child already holds. A younger child with counties outside the capital duchy is closer to a full share. Grant those counties to that child while you can still choose which ones leave your hand.
Place the grant outside the capital duchy. The capital county stays with the player heir, and the counties inside the capital duchy are the block you want in one pair of hands. A conquered county in the next duchy does this job. A barony inside the capital county stays with the heir who takes that county.
Open the succession tab after the grant. The child should show as the holder of that land. When the tab still assigns them a county inside your domain, they still expect more, and another outside county is the next grant.
The game can refuse a grant of a title the other heirs already expect, including a grant aimed at the player heir. The refusal text on the button says so. Satisfy the other heirs, then read what remains with you.
Hold the capital duchy together
When every other heir already expects a duchy, the titles inside the capital duchy pass to the player heir with the capital county. One rank up, when every other heir expects a kingdom, the titles inside the capital kingdom stay with the player heir. The succession tab shows whether you have reached that shape.
The grants in the previous section sit outside the capital duchy, so the younger children's expectations fill with land you can spare. The domain you play from stays with one child.
If the succession tab shows a second kingdom appearing under Confederate Partition, pause before taking more land. The law can create that title at death; decide whether to accept the split before you continue. The succession course explains the rule and its alternatives.
On a faith with monasticism, vows can take a child out of the succession. A barony handed to a holy order is a separate button, and the result follows that faith. Open the succession tab after the click and read the new line.
A realm you keep whole is also what converts into one country. CK3 to EU5 converter covers the handover to Europa Universalis V.
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