Theophylact I (before 864 – 924/925) was a medieval count of Tusculum who was the effective ruler of Rome from around 905 through to his death in 924. His descendants controlled the papacy for the next 100 years. Biography Theophylact was the hereditary count of Tusculum, a small hill town near the vicinity of Rome. He is mentioned for the first time in a document of 901 as palatine iudex (palace judge, or leader of the militia) of Emperor Louis the Blind. He remained in Rome, commanding a group of soldiers after the emperor's return to Provence in 902, and was prominent in the overthrow of Antipope Christopher in January 904, whom he very likely ordered to be killed whilst in prison later that year. Theophylact formed an alliance with Duke Alberic I of Spoleto, and with their combined backing, Pope Sergius III was elected in Christopher's place. During his pontificate, Theophylact became Sergius’ sacri palatii vestararius and magister militum, effectively seizing control of the city. He was also granted other honorific titles, such as senator, glorissimus dux, and dominus urbis. Sometime between the end of Sergius III's pontificate and the start of John X's, Theophylact was elected the head of Rome, under the centuries-old title of Roman consul by the city's nobility. As per the ancient office, this must have been for a year only, as in 915, he is referred to as a senator only, although first among the listed nobility. In this capacity, Theophylact was able to dominate the papal electoral process, with all popes until his death in 925 chosen after he had hand-picked them. Theophylact's rule of Rome was shared to a large degree with his wife Theodora, who was styled senatrix and serenissima vestaratrix of Rome. It was by her suggestion that the popes who followed Sergius III, Anastasius III and Lando, were chosen by her husband for the papal see. Then in 914, she prevailed upon him to support her alleged lover as pope, having him installed as John X (although it has been suggested that John was in fact related to either Theodora or Theophylact). Theophylact worked closely with the able John X, who supported Theophylact's overall objectives with regards to strengthening the imperial presence in Italy by supporting Berengar I of Italy. He fought alongside John X against the Saracens at the Battle of Garigliano in 915, and was the pope's