Footnote

e That ancient Pergamos (Pergamum) was a city of considerable wealth and stature in the fifth century B.C.E., is seen in the fact that “it had been striking coins since 420 B.C. at latest.” Before Xenophon (about 430-355 B.C.E.) mentions it in his Anabasis, VII, viii, 8, and Hellenica, III, i, 6, little is known of this cosmopolitan city but mythology.—The Encyclopædia Britannica, edition of 1946, Volume 17, page 507; also The Catholic Encyclopedia, Volume II, page 666, edition of 1911.