Z: Zeno of Citium’s epitath by Zenodotus
Bonus:
Time for Zed
Summary: Zeno died, but don't be sad.
Commentary:
Not technically in the 5FSOB, but given the amount of Stoicism included, I think a tribute to Zeno (the original Stoic), by another Stoic whose name also beings with Z, is a pretty clean include.
"hoary brow serene" is a heck of a thing to be remembered for. It's a shame that, while, "Who gave to Greece her written books of wisdom." they mostly weren't preserved.
I also like the use of "contentment". Stoicism isn't just "not being mad about stuff" it's about being happy regardless of what's going on, because you focus on the important stuff.