     __notoc__ year 756 (dcclvi) was a leap year starting on thursday (link will display the full calendar) of the julian calendar. the denomination 756 for this year has been used since the early medieval period, when the anno domini calendar era became the prevalent method in europe for naming years. == events == === by place === ==== byzantine empire ==== * byzantineâbulgarian war: emperor constantine v builds a series of fortifications along the byzantine frontier on the danube, and starts settling christian armenians and syrian in the thracesian theme. in response kormisosh, ruler (khagan) of the bulgarian empire, demands the payment of tribute. constantine refuses and the bulgars raid into thrace, reaching the anastasian wall stretching between the black sea and the sea of marmara (near the outskirts of constantinople). * battle of marcellae: constantine v sends a byzantine expeditionary force (500 ships and 6,000 cavalry) to thrace and defeats the bulgars around the danube delta, near the fortress city of markeli (modern romania). kormisosh is forced to accept a peace treaty and confirms the existing frontier.runciman s., a history of the first bulgarian empire, london g.bell & sons, 1930, pp. 37, 289 due the constant political crisis, the bulgarian empire is on the verge of destruction. kormisish is desposed during a palace coup and succeeded by vinekh, a member of the vokil clan. ==== europe ==== * king aistulf of the lombards again threaten rome with a view to making it his capital, but the franks under pepin iii ("the short") arrives with his sons charles and carloman, defeats aistulf, and confers the donation of pepin which establishes the papal states (including lands of ravenna and the pentapolis). pepin has taken territory that legally belong to the byzantine empire; he gives them to pope stephen ii. * aistulf dies in a hunting accident and is succeeded by desiderius as king of the lombards. ex-king ratchis attempts unsuccessfully to seize the throne but is opposed by stephen ii. * galla gaulo is deposed, blinded and exiled. he is succeeded by domenico monegario as the sixth doge of venice. during his reign the venetians become maritime [[tr
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