The tetrarchs

a. regional rulers who dominated trade along the silk roads.
b. christian missionaries who lost their lives spreading the faith in central asia.
c. manichaean priests.
d. he four officials who ruled the roman empire under diocletian's plan.

The correct answer is letter D.

The Tetrarchs since the late Middle Ages, the group has been set on the facade of St. Mark's Basilica, in Venice, Italy. It was probably originally part of the decorations of the Philadelphia, a public square in Constantinople, but it would have been removed by the Knights of the Fourth Crusade and taken to the Republic of Venice.

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