The sixth ruler of the Monarch's Journey, Shajar al-Durr, will be available to play in CK2 on Dec. 28 at 13:00 CET! This one will require the Sword of Islam DLC which is currently discounted!
https://store.steampowered.com/app/203778/Expansion__Crusader_Kings_II_Sword_of_Islam/
As a reminder: the Monarch’s Journey is a new way of exploring the world of Crusader Kings and will help you earn cosmetic add-ons for Crusader Kings III through Ruler Challenges.
The Ruler Challenges present you with a new realm with a specific objective to achieve. Whether you are a newcomer or a veteran The Monarch’s Journey is your chance to (re)learn parts of the game, try new worlds and new ways of play in our infinite medieval sandbox!