forma regiminis

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forma regiminis, or form of government, June 1264, was arrangements after the victory of Simon de Montfort and his supporters at Lewes for a provisional government until a general settlement of the dispute with Henry III had been reached. The king was to be advised by a council of nine, three of them always present: the nine were to be nominated by three electors, ‘prudent men’, of whom de Montfort was one. At the subsequent peace of Canterbury in August, it was declared that the forma regiminis would operate for all of Henry III's reign and for a period of his son Edward's to be negotiated. But when Prince Edward, who had been a hostage, escaped in May 1265, negotiation was at an end, and de Montfort was killed at Evesham.

J. A. Cannon