At 10,000 AD, Canterbury had the 10th largest population in England; by the early 16th century, the population had fallen to 3,000. In 1363 after the Black Death. During the Hundred Years' War, a Commission of Inquiry found that disrepair, stone-robbing and ditch-filling had led to the Roman wall becoming eroded. Between 1378 and 1402, the wall was virtually rebuilt, and new wall towers were added. In 1381, during the Peasants' Revolt, the castle and Archbishop's Palace were sacked, and Archbishop Sudbury was beheaded in London. Sudbury is still remembered annually by the Christmas mayoral procession to his tomb at Canterbury Cathedral. In 1413 Henry IV became the only sovereign to be buried at the cathedral. In 1448 Canterbury was granted a City Charter, which gave it a mayor and a high sheriff; the city still has a Lord Mayor and Sheriff. In 1504 the cathedral's main tower, the Bell Harry Tower, was completed, ending 400 years of building.
During the Dissolution of the Monasteries, the city's priory, nunnery and three friaries were closed. St Augustine's Abbey, the 14th richest in England at the time, was surrendered to the Crown, and its church and cloister were levelled.
By the 17th century, Canterbury's population was 5,000; of whom 2,000 were French-speaking Protestant Huguenots, who had begun fleeing persecution and war in the Spanish Netherlands in the mid-16th century. The Huguenots introduced silk weaving into the city, which by 1676 had outstripped wool weaving - their houses are to be found near the High Street.
Source & More Information: Wikipedia, Canterbury, //en.wikipedia.org/wiki/Canterbury