Papal power had begun to wane after…
1262 CE
Papal power had begun to wane after the death of Innocent IV, and with the usurpation of the Sicilian throne from Conradin by Manfred of Sicily in 1258, the relationship between the Papacy and the Hohenstaufen had changed again.
The long confrontation with the late Hohenstaufen Frederick II had not been pressed during the mild pontificate of Alexander IV, while it has devolved into interurban struggles between nominally pro-Imperial Ghibellines and even more nominally pro-papal Guelf factions, in which Frederick’s heir Manfred is immersed.
Instead of the boy Conradin, safely sequestered across the Alps, the Papacy now faces an able military leader in Italy, a situation that commands the full attention of Urban IV.
The pope’s military captain is the condottiere Azzo d'Este, nominally at the head of a loose league of cities that includes Mantua and Ferrara.
Any Hohenstaufen in Sicily is bound to have claims over the cities of Lombardy; accordingly, when negotiations break down with Manfred in 1262, Urban, determined to find a capable ruler willing to eliminate for him the Hohenstaufen presence in Italy, invites Charles of Anjou, brother of French king Louis IX, to conquer the Two Sicilies, thereby placing its crown of in the hands of a monarch amenable to papal control.
As Charles is Comte de Provence in right of his wife, he maintains a rich base for projecting what would be an expensive Italian war.
The terms are heavily in favor of the Pope; the Kingdom must never be reunited with the Empire, and the King is never to hold Imperial or Papal office, or interfere with ecclesiastical matters in the Kingdom.
Charles accepts eagerly.
Manfred's own usurpation from Conradin tells upon King Louis' scruples; this time, he is persuaded to admit the offer.