A Round Medieval House in Minecraft is a circular-shaped house that is built using medieval-themed blocks and materials such as cobblestone, wood, and thatch. It typically has a conical roof made of wooden planks or thatch and features small windows and a door. The interior of the house usually includes a fireplace, a bed, and some basic furniture. It is a popular design choice for players who want to create a medieval-themed village or town in their Minecraft world.