“The timeline above displays the itinerary of King John of England for nearly every day of his seventeen year reign. Like most medieval kings, John’s government was relentlessly itinerant. The places he visited are plotted on the map, changing dynamically, reflecting the places displayed in the lower band of the timeline. The timeline can be scrolled left and right by clicking and dragging, and you can observe John’s progress as he traveled throughout England, Wales, Ireland, and France. The top band displays contextual events of general interest for the period, and the highlighted bar in the middle of the band represents the period of time pictured in the lower band.
The data displayed in this timeline was published in tabular format in the Rotuli Litterarum Patentium in Turri Londinensi Asservati, edited by Thomas Duffus Hardy, and published in 1835. This essential source for students of the period is a large folio volume not widely available and rather awkward to use. Both the itinerary and the text of the patent rolls themselves are presented here in a more convenient form as a service to historians and students…”