Relations were very strained in the mid-8th century between the
papacy and the
Eastern Roman emperors over the support of the
Isaurian dynasty for
iconoclasm. Likewise, maintaining political control over Rome became untenable as the
Eastern Roman Empire itself was beset by the
Abbasid Caliphate to the south and
Bulgars to the northwest. Constantinople could send no troops, and Emperor
Constantine V Copronymus, in answer to the repeated requests for help of the new pope, Stephen II, could only offer him the advice to act in accordance with the ancient policy of Rome, to pit some other Germanic tribe against the Lombards. Stephen turned to
Pepin the Short, the
king of the Franks who had recently defeated the Muslim
Umayyad invasion of Gaul. He traveled to
Paris to plead for help in person against the surrounding Lombard and Muslim threats. On 6 January 754, Stephen re-consecrated Pepin as king. In return, Pepin assumed the role of ordained protector of the Church and set his sights on the Lombards, as well as addressing the threat of Islamic
Al-Andalus. Pepin invaded Italy twice to settle the Lombard problem and delivered the territory between
Rome and
Ravenna to the papacy, but left the Lombard kings in possession of their kingdom. ==Duchy of Rome and the Papal States==