Ishmaelite Papyrus — Found

 

*Could this be the Ishmael that murdered – (the plot includes lashon hara and/or sinat chinam)

Gedaliah ben Ahikam: (a) (d. 423 BCE) After Nebuchadnezzar exiled most of the Jews from Israel, he appointed Gedaliah to govern those who remained. Gedaliah advocated submission to Babylon as a means of ensuring continued partial Jewish autonomy, and under his administration, the Jewish colony prospered. When he was assassinated by political rivals, the Jews scattered and all remaining vestiges of Jewish autonomy were lost. His assassination is commemorated yearly with the Fast of Gedaliah. (b) A common Jewish name.

From the Chabad website:

6. He Naively Rejected Reports of a Conspiracy

Among those who gathered around Gedaliah was Ishmael ben Netanya, a man of royal ancestry who believed the rulership was his inheritance.⁹ Yochanan ben Kore’ach warned Gedaliah that Ishmael had been sent by Baalis, king of Amon, to kill him. Recognizing that Gedaliah’s death would spell the end of Jewish life in the Holy Land, Yochanan offered to kill Ishmael, but Gedaliah rebuffed the report, replying, “Do not do this because you speak lies about Ishmael.”¹⁰

7. He Was Killed by Ishmael

Ultimately Gedaliah gravely miscalculated. On the “seventh month” (Tishrei), Ishmael and 10 henchmen joined Gedaliah for a Rosh Hashanah meal.¹¹ They then arose and killed Gedaliah and his men, including the Babyolian representatives.¹² Their remains, as well as those of Jews who unwittingly happened upon the carnage, were thrown into a giant pit.¹³

^{The complete story and footnotes at}h

https://www.chabad.org/library/article_cdo/aid/5238303/jewish/10-Facts-About-Gedaliah-Everyone-Should-Know.htm#footnote10a5238303

* there is no confirmation, or actual evidence, just speculation