Which English king ordered the erection of twelve stone monuments called Eleanor crosses, of which three survive nearly intact today?

The Eleanor crosses were a series of twelve lavishly decorated stone monuments topped with tall crosses, of which three survive nearly intact, in a line down part of the east of England. King Edward I had the crosses erected between 1291 and 1294 in memory of his wife Eleanor of Castile, marking the nightly resting-places along the route taken when her body was transported to London. Several artists worked on the crosses, as the "Expense Rolls" of the Crown show, with some of the work being divided between the main figures, sent from London, and the framework, made locally. "Alexander of Abingdon" and "William of Ireland", both of whom had worked at Westminster Abbey, were apparently the leading sculptors of figures.

The only three crosses still standing are those at Geddington, Hardingstone, just outside Northampton, and Waltham Cross, although remnants of the lost ones can also be seen at other sites.