This week, we're tracing the fascinating story of an almost forgotten currency. In early medieval England, eels were exchanged for goods and services and to settle debts. We're joined by medievalist and cartographic historian Dr John Wyatt Greenlee to reveal how these once abundant fish powered the medieval economy, why they were coveted as both a food and currency and what caused their eventual fall from favour.  To learn more about Meare Fish House or plan a visit, go to www.english-heritage.org.uk/visit/places/meare-fish-house. Learn more about your ad choices. Visit megaphone.fm/adchoices