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 "Sacred grove"): Examples of sacred groves include the Greco-Roman "temenos", the Norse "hörgr", and the Celtic "nemeton", which was largely but not exclusively associated with Druidic practice.
Relevant evidence: No