Question: A sacred grove or sacred woods are any grove of trees that are of special religious importance to a particular culture, during the Northern Crusades, were religious wars undertaken by Catholic Christian military orders and kingdoms, there was a common practice of building churches on the sites of what?
Sentence (from "Northern Crusades"): The crusades took place mostly in the 12th and 13th centuries and resulted in the subjugation and forced baptism of indigenous peoples.
Relevant evidence: No