a divine judgment on the moral lapses of Christian princes. He was also determined to protect what he called "the liberty of the Church" from inroads by secular princes. This determination meant, among other things, that princes should not be involved in the selection of bishops, and it was focused especially on the "patrimonium" of the papacy, the section of central Italy claimed by the popes and later called the Papal States. The patrimonium was routinely threatened by Hohenstaufen German kings who, as Roman emperors, claimed it for themselves. Emperor Henry VI expected his infant son Frederick to bring Germany, Italy, and Sicily under a single ruler, which would leave the Papal States exceedingly vulnerable. Henry's early death left his 3-year-old son, Frederick, as king of Sicily. Henry VI's widow, Constance of Sicily, ruled over Sicily for her young son before he reached the age of majority. She was as eager to remove German power from the kingdom of Sicily as was Innocent III. Before her death in 1198, she named Innocent as guardian of the young Frederick until he reached his maturity. In exchange, Innocent was also able to recover papal rights in Sicily that had been surrendered decades earlier to King William I of Sicily by Pope Adrian IV. The Pope invested the young Frederick II as King of Sicily in November 1198. He also later induced Frederick II to marry Constance of Aragon, the widow of King Emeric of Hungary, in 1209. Involvement in Imperial elections Innocent was concerned that the marriage of Henry VI and Constance of Sicily gave the Hohenstaufens a claim to all the Italian peninsula with the exception of the Papal States, which would be surrounded by Imperial territory. After the death of Emperor Henry VI, who had recently also conquered the Kingdom of Sicily, the succession became disputed: as Henry's son Frederick was still a small child, the partisans of the Staufen dynasty elected Henry's brother, Philip, Duke of Swabia, king in March 1198, whereas the princes opposed to the Staufen dynasty elected Otto, Duke of Brunswick, of the House of Welf. King Philip II of France supported Philip's claim, whereas King Richard I of England supported his nephew Otto. In 1201, the pope openly espoused the side of Otto IV, whose family had always been opposed to the house of Hohenstaufen.It is the business of the pope to look after the