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The original was posted on /r/todayilearned by /u/starkfr on 2023-08-07 22:12:17.

Original Title: TIL that the earliest known depiction of a handshake is an ancient Assyrian relief of the 9th century BC depicting the Assyrian King Shalmaneser III shaking the hand of the Babylonian King Marduk-Zakir-Shumi I to seal an alliance.