I was doing some reading online and came across this website: http://www.simpletoremember.com/articles/a/HistoryJewishPersecution/
It is a list of events of jewish persecution and the ninth on the list is the Ipahan holocaust. I have tried to do research but can not find any information on it. I hope that somebody here can answer what exactly this event is referencing.
"Ipahan" is another rendition of the name of the city in modern-day Iran currently called "Isfahan."
Isfahan is recorded as being founded by Jewish peoples and having been substantially Jewish in its early days. By the time in question, around 468 CE, it was under the control of the Persian Sassanids. The event in question occurred during the tenure of a governor whose name is rendered as Fruz or Peroz.
The "Ipahan holocaust" refers to an event where two Persian magi (holy men) were flayed alive in Isfahan. In retaliation, half of the Jewish population of Isfahan was put to death by the Persian state.
Frankly whoever wrote your site's narrative was quite concerned with the narrative and less with actual history. Hence why it's described as a "holocaust," why the date is incorrectly claimed as 469 rather than the correct 468, and why they decided to call the city "Ipahan" when that is one of the least-recognizable names for Isfahan.
I hope that answers your question. If you want to know more, all the texts cite Hamza al-Isfahani's Chronology (of the Jewish Peoples). You may have to pay for a good translation.
Jacob Neuser's book A History of the Jews in Babylonia, Part V: Later Sasanian Times gives a good overview, is in English, and names some other key sources if you want to know even more.
"According to Hamza Isfahani, cited by Geo Widengren, in the eleventh year of Peroz (that is, 468), Jews of Isfahan flayed two Magi alive. As a result, half the Jewish population of Isfahan was slaughtered, and the children were handed over to the service of the fire-temple at Harvan. Gottwaldt's Latin translation of the passage in the history of Hamza Isfahani (ed. Leipzig, 1848, II, p. 41) is rendered by Professor Michael Putnam as follows:
Dimidiam Judaeorum Isphanensium partem interfici puellosque eorum pyreo pagi Hervan, Surusch Adzeran, ad opera servilia tradi jussit, quia tergis duorum archimagorum pelles detraxerant, deinde ambas inter se compatactas subigendo ad usum suum paraverant.
He ordered half of the Jews of Isfahan to be killed and their children to be given over to the service of the fire-temple of Surusch Adzeran [Widengren: Sros Aduran] in the village of Hervan, because they had flayed the backs of two of the chief Magi...