Hampshire-based Butser Ancient Farm in Chalton invites visitors to honor the ancient Roman festival of Agonalia this weekend. The event, taking place on May 18th and 19th, will feature a battle for Britannia between the Anglo Saxon reenactment group Herigeas Hundas and the Roman and Iron Age tribes represented by The Vicus. According to Herigeas Hundas Media Officer Jen Atkinson…