During the Middle Ages, King's Lynn flourished as a bustling port. In 1174, King John granted it a charter, formally establishing it as a borough and marking the beginning of its golden age. The town's prosperity grew rapidly as merchants built grand stone houses and warehouses along the waterfront. The construction of St. Margaret's Church (now King's Lynn Minster) in the 12th century demonstrated the town's growing wealth and importance. By the 13th century, King's Lynn had become one of England's most important ports, with ships regularly trading wool, grain, and wine with European markets. The town's medieval Saturday Market Place, established during this period, remains a testament to its commercial heritage.