Ratchis[1] (died after 757) was the Duke of Friuli (739–744) and then King of the Lombards (744–749).
Ratchis was the son of Duke Pemmo of Friuli and the nephew of the Lombard king Liutprand, who, despite his history of strife with Pemmo, appointed Ratchis to succeed his father in 737. Ratchis was married to a Roman woman named Tassia. During his rule of Friuli, he launched an expedition against the SlavsinCarniola, across the Eastern Alps, fighting in person during the battles.
Ratchis denique aput Foroiuli dux, ut dixeramus, effectus, in Carniolam Sclavorum patriam cum suis ingressus, magnam multitudinem Sclavorum interficiens, eorum omnia devastavit.
— Paulus Diaconus, Historia Langobardorum, Liber VI [2]
He became king of the Lombards in 744, after the deposition of Hildeprand, most likely with the support of the more autonomous Lombard dukes. Ratchis ruled initially in peace, in particular with the neighboring Byzantine-ruled exarchate of Ravenna. However, perhaps pushed by more traditional parties among his followers, in 749 he invaded the Duchy of the Pentapolis and besieged Perugia. Pope Zachary convinced him to lift the siege, but this further reduced his prestige among the dukes, who deposed him later year at an assembly in Milan. His brother Aistulf succeeded him. Ratchis initially tried to raise opposition to the assembly's decision, but soon was forced to take refuge in Rome. He later entered the abbey of Montecassino with his family.
Following Aistulf's passing in 756, Ratchis fought to reclaim the throne. He was able to gain control of the royal palace in Pavia with the support of several Lombard nobles, but was defeated by the duke of Tuscany, Desiderius, who had the support of Pope Stephen II and the Frankish king Pepin the Short. In 757, Ratchis retired again to a monastery, either Montecassino or Cervaro.
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| Preceded by | Duke of Friuli 739 – 744 |
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| Preceded by | King of the Lombards 744 – 749 | |
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