Yulyush K'ayshar was a Romulan ambassador who later held an unspecified political role in the Romulan Star Empire.

In 2268, K'ayshar was credited with bringing about the Klingon-Romulan détente and became respected by Klingons for doing so, including Wil'yam Shex'pir. Shex'pir later wrote a play about K'ayshar after K'ayshar fell from power. (ST reference: The Klingon Hamlet)

The character is a reference to the historical Julius Caesar and the play Julius Caesar.
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