Docibilis I (Italian : Docibile; died before 914) was the hypatus of Gaeta from 867 until his death.
The sudden disappearance of the co-hypati Constantine and Marinus I after 866 suggests that Docibilis' assumption of power was violent. He is first cited as a prefecturius and then as hypatus from 877, when he followed his predecessor's example and associated his son John with him.
In his first years in office, he was faced with raids by the Aghlabids and he fell into their hands. After being liberated by Amalfi, he made peace with the Aghlabids and was excommunicated by Pope John VIII. In 876, the pope was down in the Mezzogiorno recruiting the princes of Capua and Salerno for the war with the Aghlabid Emirate of Sicily. Docibilis met the pope at Traetto, but could not come to terms. The pope then interfered in the Capuan succession on the death (879) of Landulf II to impose Pandenulf over Lando in return for Pandenulf attacking Docibilis. Formia was captured and Docibilis called up some Saracen mercenaries from Agropoli. He met the pope at Gaeta itself and made peace. Together they besieged the Saracen fortress on the Garigliano.
After the pope's death, he turned around and attacked Capua, according to Erchempert, with Aghlabid mercenaries in 900 and 903. He then began to turn and form alliances with the Lombard rulers, marrying his daughter Megalu to Rodgipert of Aquino and Euphemia to the prefect of Naples. Docibilis appears for the last time in 906 and may have died then, though it is only certain that he was dead by 914. His long career was the golden age of Gaeta in the Dark Ages. He began construction on the great palace whose ruins still stand in the city and he spent profusely on churches and ecclesiastic endowments for the sake of his soul. He was a warrior-prince as well, whose quarrels with all his neighbours, Muslim and Christian, Lombard and Byzantine Greek, ecclesiastic and secular, fill the chronicles of the age, especially Erchempert's. For this, it is likely that after 906, he was either dead or retired.
By his wife Matrona, he had two other sons besides John, Leo and Anatolio, whom he made duke of Terracina. He had two other daughters besides Megalu and Euphemia: Bona and Maria. John succeeded him and immediately associated his son and his father's namesake, Docibilis II, in the duchy. It is just possible that all three were associated together, but it cannot be proven.
Gaeta is a seaside city in the province of Latina, in Lazio, Italy. Set on a promontory stretching towards the Gulf of Gaeta, it is 96.5 kilometres from Rome and 133 km (83 mi) from Naples.
The Duchy of Benevento was the southernmost Lombard duchy in the Italian Peninsula that was centred on Benevento, a city in Southern Italy. Lombard dukes ruled Benevento from 571 to 1077, when it was conquered by the Normans for four years before it was given to the Pope. Being cut off from the rest of the Lombard possessions by the papal Duchy of Rome, Benevento was practically independent from the start. Only during the reigns of Grimoald and the kings from Liutprand on was the duchy closely tied to the Kingdom of the Lombards. After the fall of the kingdom in 774, the duchy became the sole Lombard territory which continued to exist as a rump state, maintaining its de facto independence for nearly 300 years, although it was divided after 849. Benevento dwindled in size in the early 11th century, and was completely captured by the Norman Robert Guiscard in 1053.
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Docibilis II was the ruler of Gaeta, in one capacity or another, from 906 until his death. He was the son of the hypatus John I, who made him co-ruler in 906 or thereabouts.
John I was the second hypatos of Gaeta of his dynasty, a son of Dociblis I and Matrona, and perhaps the greatest of medieval Gaetan rulers.
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