Although Franco-Irish intrigue during the period 1553–67 never reached the intensity or the seriousness that it had in the winter of 1549–50, a level of engagement between the French and Scottish courts and Irish dissidents persisted throughout the following two decades and quickened significantly in three distinct phases. The first serious engagement in the autumn and winter of 1553 centred on a plot to stage an uprising in Ireland to coincide with Sir Thomas Wyatt's rebellion in England. The crucial parties to this intrigue were Antoine de Noailles and Henri Clutin d'Oisel, ambassadors to England and Scotland respectively, along with Marie de Guise, the ringleaders of the Wyatt rebellion and probably Henri II. The second though much less consequential episode occurred in spring 1557, on the eve of the outbreak of war between France and England, when an Irishman named Power sought to capitalise on the tensions between the two monarchs by presenting Henri II with a proposal for a French invasion of Ireland.