Tom Holland and his guests showcase the stories that are making history. Helen Castor heads for Wales and new scientific research telling us much more about what the Romans ate and how far away they had to source their food to feed their armies. Helen's in Newport, not far from Caerleon which was one of only three permanent fortresses in Roman Britain. Here, archaeologists and scientists from Cardiff University are using dental palaeopathology to discover where the animals that were slaughtered for their meat came from. The results suggest that so-called supply chains were as long and involved as they are today. Also, we cross the Bristol Channel for more food history as reporter Hester Cant tastes the city's vibrant street food culture and discovers just how long its been established in the UK. Producer: Nick Patrick A Pier production for BBC Radio 4.