Give the Silver To Ynr Ap Cadfarch, Angharad, or Gwriad Ap Merfyn?
Once you’re in the church during War Weary, you’ll be given 650 silver which you can use in an attempt to secure peace. In truth, peace is impossible in this situation, so it won’t matter what you do with the silver. However, there two people who you can give the silver to, but you won’t get it back. These are Ynr Ap Cadfarch and Angharad. Do not give the silver to either of these if you want to get it back. If you really want to, you can give the silver to Gwriad Ap Merfyn, who will accept it and agree to forming an alliance with Eivor. however, Gwriad will be killed soon after, and you’ll be able to loot the silver from his corpse.
Keep the Silver For Yourself
If you want to skip speaking with everyone in the church, just speak with Bishop Deorlaf immediately. You will be able to lie about who you gave the silver to, while keeping it for yourself. Bishop Deorlaf won’t find out, so you don’t need to worry about the consequences.