High Quality Content by WIKIPEDIA articles! A king post (or king-post) is a central vertical supporting post used in architectural, bridge, or aircraft design applications. A king post (or crown post) extends vertically from a crossbeam to the apex of a triangular truss. The king post connects the apex of the truss with its base, holding up the tie beam at the base of the truss. King posts were used in roof construction in Medieval architecture in buildings such as parish churches and tithe barns, and also appear in Gothic Revival architecture and Queen Anne architecture. A similar structure may be used to construct a simple bridge.