Which of these phases fill in those blanks: eastern orthodoxy| greek fire | roman catholicism | caesar | patriarch | tsar the kievan rus developed close ties with the byzantines, leading early russia to adopt the first russian empire revered the roman and byzantine empires, and adopted the title of for its emperors in honor of former rulers in rome.

The phrases that fill the blanks are : Eastern Orthodoxy and Tsar.

The Kievan Rus developed close ties with the Byzantines, leading early Russia to adopt Eastern Orthodoxy (This process was called the christianization of Kievan Rus). The first Russian empire revered the Roman and Byzantine empires, and adopted the title of Tsar for its emperors in honor of the former rulers in Rome.

The Byzantine was the Eastern Roman Empire on Constantinople until the 15th century, and practiced Orthodox Christianity.

Kievan Rus was a state of East Slavic & Finnic peoples in Europe, from Belarus, Ukraine, and Russia; Vladimir the Great, (prince of Kiev), converted to Christianity to marry the Byzantine emperor's sister and formed an alliance with them; this pushed the Christianisation of of Russia embracing Eastern Orthodoxy.

The term Tsar, also spelled czar, or tzar was the Russian form of the Roman imperial title "Caesar", used to appoint supreme rulers of Eastern Europe, particularly the Byzantine ones, as the heads of the Orthodox Christian world, meaning emperor or king in Russia until 1917.

a) which ethnic groups live in this community?

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answer; a cost benefit analysis;