It was recorded by contemporary chroniclers that King John's crown jewels and other valuable crown possessions were lost in marshland when the horse-drawn baggage train of his army attempted to cross without a guide the causeway and ford across the mouth of the Wellstream on 12 October 1216 in passing from Bishop's Lynn (now King's Lynn) via Wisbech en route to Sleaford. On departing from Bishop's Lynn, King John had apparently chosen the safer route through Wisbech in the Isle of Ely, Cambridgeshire. This baggage train route was usable only at low tide. The horse-drawn wagons moved too slowly for the incoming tide or flood tide, and most were lost with only few men surviving. The King died a week later of dysentery and he was succeeded to the throne by his 9-year-old son, Henry III.