Ainz - Money Money Money

“Then how about this: I’ll buy some of this village’s goods at a reasonable price, and then you can pay me with the coins I give you.” Ainz surreptitiously opened his item box beneath his robe and picked up two of Yggdrasil’s gold coins. One featured the relief of a woman’s profile, and the other, a man’s. The former was currency that came into use after the huge update, “The Fall of Valkyria,” and the latter, naturally, was the old kind. Monetarily they were both the same value, but he was more attached to one
of them.

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Volume 1, Chapter 4.1