Around Mt. Hermon, Charles Warren hears the story of the mosquito that got into Nimrod's brain and killed him.
Apparently this is a variant of a very popular story.

(PEF Quarterly Statement no. 5, January-March 1870)

As Warren says, Layard tells of a similar story about a gnat getting into Nimrod's brain and killing him, which he heard near Nimrud in Iraq.

(Layard, Nineveh and Its Remains)

According to Layard, manuscripts with the title Qiṣat al-Nimrūd (the Story of Nimrud) circulated in Mosul, and the tales -- including Nimrod's death by gnat -- were known in the villages around Nimrud.

Thanks to @iandavidmorris for pointing to the age of this story in Islamic tradition.
Here it is in the History of al-Ṭabarī (d. 923 CE)
(SUNY translation, vol. 2, Prophets and Patriarchs, trans. William Brinner, 1987)

The Talmud (BT Gittin 56b) has a very similar story, but about Titus.

The idea expressed here -- & also by al-Tabari -- is that God brings down the mighty Nimrod by the lowliest of his creatures.

(via http://sefaria.org )

For further reference: https://twitter.com/iandavidmorris/status/1305981549435854851