Quay had its first public showing in Manhattan.
The hexagram -LRB- εξαγραμμα , hexagramma -RRB- was a large silver coin of the Byzantine Empire issued primarily during the 7th century AD .. silver. silver. coin. coin. Byzantine Empire. Byzantine Empire. With the exception of a few 6th-century ceremonial issues , silver coins were not used in the late Roman / early Byzantine monetary system -LRB- see Byzantine coinage -RRB- , chiefly because of the great fluctuation of its price relative to gold .. silver. silver. Byzantine coinage. Byzantine coinage. Only under Emperor Heraclius -LRB- r. 610 -- 641 -RRB- , in 615 , were new silver coins minted to cover the needs of the war with Sassanid Persia .. silver. silver. Heraclius. Heraclius. war with Sassanid Persia. Byzantine-Sassanid War of 602–628. The material for these coins came chiefly from the confiscation of church plate .. They were named after their weight of six grammata -LRB- 6.84 grams -RRB- , and probably valued at 12 to the gold solidus .. solidus. solidus ( coin ). The Hexagrams uniquely carried the inscription of Deus adiuta Romanis or `` May God help the Romans '' ; It is believed that this shows the desperation of the empire at this time .. The coin remained in regular issue under Heraclius 's successor Constans II -LRB- r. 641 -- 668 -RRB- , from whose reign many specimens survive , but becomes rarer for Constantine IV -LRB- r. 668 -- 685 -RRB- , and thereafter seems to have been only occasionally minted as a ceremonial coin until Theodosius III -LRB- r. 715 -- 717 -RRB- .. coin. coin. Heraclius. Heraclius. Constans II. Constans II. Constantine IV. Constantine IV. Theodosius III. Theodosius III. In 720 Emperor Leo III the Isaurian -LRB- r. 717 -- 741 -RRB- issued a new silver coin , the miliaresion .. silver. silver. coin. coin. Leo III the Isaurian. Leo III the Isaurian. miliaresion. miliaresion