The opening, from 1066
Play the first century as a chain of heirs, starting with Petty King Murchad of Munster in 1066. He is the recommended new player and the tutorial character. The classic goal is the Kingdom of Ireland. The decision tooltip lists what that takes right now.
On day one, pause. Check the heir. If the line is empty, marry. Set the realm priest to convert a county that does not share your faith, and set the spymaster to find secrets if you want hooks later. Open realm laws and count how many titles you hold at your highest rank.
Fight only with a casus belli, and only when the war helps a requirement the Ireland tooltip actually names. A war that qualifies you for a second title of your own rank is a succession problem wearing a victory screen. Read the succession page before you chase that land.
Take the years you need. The century here means several rulers in a row.
Murchad of Munster in the 1066 bookmark is recommended for new players and is used for the tutorial. Ireland is the classic goal.
If you do not produce a suitable heir, the line and the game end, so the first decade is an heir problem before it is a map problem.
A neighbor alliance, and the steward's county
The first marriage can be a shield. In the 1066 start, a spouse from a neighbor such as Alba or an English duke can give you an ally for a war on your island. Read who you are allying before you accept the match. That house can also call you into a war across the sea.
When the call arrives, open it and read the refuse line. The line shows the prestige and the opinion attached to staying home. A refused call keeps the levy and the treasury on the island. March when the war is on your island, or when the Ireland tooltip names the land.
Leave the steward on Increase Development in the capital county through the opening decades. Development there raises what the domain can pay. Move the steward when a war needs a different task, and return them when the peace screen closes.
This is the pacing around the Ireland decision. Before a war that would let you create a second kingdom, read the succession tab and the partition page.
The middle years, when Ireland is the goal
Form the kingdom when the tooltip says you qualify. After you are king, look at any other kingdom you already qualify to create. Confederate Partition can create that uncreated title and hand it to a child of your rank. That child can leave independent.
The quiet plan is one title of your highest rank. Younger children then stay vassals under ordinary partition. They can receive lower titles, and they stay inside the realm. Create a second kingdom when you have decided the split is acceptable, or when the realm law screen lets you pass a single-heir law.
Keep the priest converting counties you care about. Keep a war's peace screen honest: enforce demands, white peace, or surrender, each read before you click. A white peace is a finished war. You can go back to the Ireland tooltip and the family screen.
Confederate Partition can create a title of your highest rank that you qualify for and have not created, then give it to a child who can leave independent.
One title of your highest rank keeps younger children as vassals under ordinary partition.
The rulers who inherit the century
Each death is a new person. The new ruler has their own stress, their own hooks, and their own council tasks. On the first day, reopen the character screen, reopen realm laws, and confirm the heir. A tutorial you remember from Murchad does not auto-play the grandchild.
Primogeniture and similar single-heir laws come from later cultural innovations. Somewhere in a long century a culture can reach them. The realm law screen is how you know. Pass the law when it is offered and when you want one child to take the top title.
If you are the dynasty head and one child would wreck the realm, disinherit spends renown. The action shows the cost. Disinheriting the only suitable heir is how a dynasty deletes itself. Keep one heir who can inherit.
Hybrid culture is optional in this century. It needs Royal Court or Khans of the Steppe, counties of both cultures, and acceptance at the threshold the decision shows. The base threshold is 40%. The culture page walks through the button.
Single-heir laws come from later cultural innovations, and the dynasty head can spend renown to disinherit, with the cost left on the game button.
Hybrid cultures need Royal Court or Khans of the Steppe. Base acceptance is 40%, and traditions or traits can move that line.
What ends the century early
The century happens only if every ruler produces a suitable heir. One gap ends the line and ends the game. That is the launch rule, and it outranks any map goal, including Ireland.
The other early ending is a split you did not notice. Confederate Partition mints a same-rank title, a child leaves, and the next session starts with a smaller realm. Check titles of your highest rank before each succession.
When the hundred years are behind you, you already know the loops. Heir, one top title, priest, casus belli, hooks, and the decision tooltip. Later bookmarks such as 1178 are a different door. They are not required for this campaign.
If you plan to carry the realm into Europa Universalis V, read CK3 to EU5 converter first. The preview build turns independent realms into countries, so a partition before the save shows up on the EU5 map.
The launch note ties the end of the game to the end of the line: no suitable heir, no campaign.
The AUTOMATON guide of 22 Nov 2025 also describes the partition split that can shrink a realm at the moment a ruler dies.
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