     __notoc__ year 577 (dlxxvii) was a common year starting on friday (link will display the full calendar) of the julian calendar. the denomination 577 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 ==== * byzantineâsassanid war: a byzantine expeditionary force under command of justinian (magister militum) invade caucasian albania, launching raids across the caspian sea against the persians. * summer &ndash; tiberius, byzantine co-ruler (caesar), establishes a naval base at derbent on the caspian sea to construct a byzantine fleet (approximate date). * winter &ndash; maurice is appointed commander-in-chief of the byzantine army in the east. he succeeds justinian, despite complete lack of military experience. ==== europe ==== * battle of deorham: the anglo-saxons under ceawlin of wessex invade the lower severn valley, and defeat the british celts at dyrham (south west england). after the battle the saxons occupy the three cities: cirencester, gloucester and bath, bringing their advance to the bristol channel (according to the anglo-saxon chronicle). ==== asia ==== * winter &ndash; northern qi, one of the northern dynasties, is conquered by northern zhou under emperor wu di. he orders the last ruler gao wei and other members of the gao clan, to commit suicide. northern china, above the yangtze river, is once again brought under the control of a single power.imperial chinese armies (p. 23). c.j. peers, 1995. isbn 978-1-85532-514-2 === by topic === ==== religion ==== * eutychius is restored as patriarch of constantinople after an exile of 12 years at amasia (modern turkey). * muhammad, age 6, returns to his immediate family, but within a year his mother aminah bint wahb dies. ==== science and invention ==== * a predecessor of the modern match, small sticks of pinewood impregnated with sulfur are first used in china. besieged by military forces of northern zhou and chen, northern qi court ladies use the "lighting sticks" to start fires for cooking an
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