The Exilarch ("Reish Galuta") of Babylonian Jewry, Huna Mori bar Mar Zutra, was executed in Pumpadita by order of the Persian emperor on the 18th of Tevet of the year 4229 from creation (469 of the common era). Also killed on that day was Rav Mesharshia bar Pekod (the third Jewish leader who was arrested with them, Rav Ameimar bar Mar Yenuka, was executed two months later).
The 18th of Tevet the yahrtzeit (anniversary of the passing) of Rabbi Zvi Elimelech Shapiro of Dynov (1783?-1841), author of the Chassidic work B'nei Yissachar.
Links: Read two stories about the Rabbi
Forty-Three Rubles
The Mystery of the Troubled Wool Merchant
Also, learn a teaching of the B'nei Yissachar
People think that Torah is about something: that it comes to explain our world, what has happened and what will happen, where each thing belongs and what to do with it.
In a way, this is true. But ultimately, Torah isn’t about anything—everything is about Torah.
Before creating a world, the sages say, G-d first composed a blueprint from His Torah. This Torah that we unfold in our world is that primordial Torah speaking within the parameters of our world.
G‑d emanated light, created a world and filled it with events, people and things, all so we would have means and metaphor to discuss His thoughts.