A List of Revenues of the Darius I, Great King of Persia, is reported by Greek Historian Herodotus c 480 BC. This serves to show the greatness of Darius and the Persian empire, show who was paying tribute to the empire and how much they were capable of paying.
A talent of silver was a considerable sum of money, but making exact conversions to modern currency is problematical at best. Further compounding the problem are differences in how weights were measured.
Annual tribute (in silver talents) Satrapy Babylonian Weight Attic Weight Ionia (Yauna) 400 520 Lydia (Sparda) 500 650 Phrygia-Cappadocia (Katpatuka) 360 468 Cilicia (Kilikes) 360468 An Additional 140 Babylonian talents = 182 Attic talents was paid to the garrison of the Gülek Pass(Cilician Gates)Syria (Abar-Nahara)350 455 Egypt (Mudraya) 700 910The Persian garrison in the White Tower at Memphiswas provided with provisions, including 120,000 medimnoi,which were the annual grain rations for 20,000 men.In Athenian money of 450 B.C. this represented a market valueof 600,000 drachmae or 100 Attic talents (= 70 Babylonian talents).Sattagydia-Gandhara 170 222Susiana (Uvja) 300 390Babylonia & Assyria 1,000 1,300 Media (Mada) 450 585 Caspia 200 260 Bactria 360 468Armenia 400 520 Sagartia-Drangiana 250 325Sacae 600 780 Parthia (Parthava) 300 390 Paricania 400 520 Alordia 200 260Tibarene 300 390 India (Hindush) 4,6806,084 -At a gold - silver ratio of 1-13 this yields an equivalentin silver of 4,680 Babylonian talents.Total 12,280 15,964
References
Sources Herodotus III. 90-96 and cf. A. R. Burn, Persia & the Greeks (New York, 1962), pp. 123–126.