Richard II was deposed and imprisoned in 1399, and died in mysterious circumstances the following year. Opposition to the new king, Henry IV, was particularly strong in Wales and Cheshire, and in 1400 serious civil unrest broke out in Chester. Henry had already declared Owain Glyndŵr, a descendant of the Princes of Powys, a traitor, and on 16 September 1400 Owain launched a revolt. He was proclaimed Prince of Wales, and within days a number of towns in the north east of Wales had been attacked. By 1401 the whole of northern and central Wales had rallied to Owain's cause, and by 1403 villages throughout the country were rising in support. English castles and manor houses fell and were occupied by Owain's supporters. Although the garrison at "Criccieth Castle" had been reinforced, a French fleet in the Irish Sea stopped supplies getting through, and the castle fell in the spring of 1404. The castle was sacked; its walls were torn down; and both the castle and borough were burned. The castle was never to be reoccupied, while the town was to become a small Welsh backwater, no longer involved in affairs of state. The town was described in 1847 as follows,