The Letters of Sor María to Felipe IV Historical milestone · Ágreda, Moncayo, Soria Image of Ágreda, not of the place itself. For twenty-two years, between 1643 and 1665, the abbess kept up with the king a correspondence of more than six hundred letters in which she advised on political, military and financial matters: a unique case of female influence at court. 1643-1665 Photo: Ecelan (CC BY-SA 3.0 es) What to see and do in Ágreda