You will receive this quest when you complete the Ledecestrescire arc - "The Kingmaker's Saga".
King Burgred has been ousted and an alliance has been forged with Ubba and Ivarr Ragnarsson, and with the new King of Mercia, Ceolwulf. Return to Randvi with the news.
Just go back to your settlement and tell Randvi what you have achieved in Ledecestrescire. This will end this short quest.
After teaming up with the sons of Ragnar, Eivor and Sigurd leave Ledecestre with new friends in Ivarr and Ubba, and a new allied king in Ceolwulf.
