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Rothari (or Rothair), (c. 606 – 652), of the house of Arodus, was king of the Lombards from 636 to 652; previously he had been duke of Brescia. He succeeded Arioald, who was an Arian like himself, and was one of the most energetic of Lombard kings. Fredegar relates (Chronicle, 71) that at the beginning of his reign he put to death many insubordinate nobles, and that in his efforts for peace he maintained very strict discipline.
Rothari conquered Genoa in 641 and the rest of Eastern Roman Liguria in 643. He conquered all remaining Eastern Roman territories in the lower valley of the Po, including Oderzo (Opitergium) in 641. According to Paul the Deacon, "Rothari then captured all the cities of the Romans which were situated upon the shore of the sea from the city of Luna in Tuscany up to the boundaries of the Franks." (IV.xlv)
With these quick conquests, he left the Eastern Roman with only the Ravennan marshes in northern Italy. The exarch of Ravenna, Plato, tried to regain some territory, but his invading army was defeated by Rothari on the banks of the Scultenna (the Panaro) near Modena, with the loss of 8,000 men, in 645. However, he recaptured Oderzo at same year. Oderzo finally was razed again by Grimoald in 667.
Rothari's most lasting act was drawing up the eponymous Edictum Rothari which was the first written codification of Lombard law (it was written in Latin). He convened a gairethinx to affirm this new and improved collection of old tradition in 642 or 643. The edict only covered his Lombard men and subjects: Romans continued to live under Roman law in Lombard jurisdictions.