How fast would news likely travel that a new continent was discovered between adversary nations?
My world has multiple continents completely seperated by the ocean. The distances are great enough that over centuries, people assumed they were the only ones.
Eventually one state (A) discovered the existence of another continent (B). This led to conflict and the different groups of people that exist on the two continents aren't actively exchanging knowledge. Now I want a third continent (C) to be discovered by A.
How long would it likely take until B finds out about C's existence? The technology level is similar to the 13th century. Generall, how did internal news about A and B likely reach the other continent? (I am aware that this depends on a multitude of factors, but would appreciate a rough time frame anyways!)