Mother to Ambassador Spock.
From Fandom: Amanda is "An Earth woman living on a planet where love, emotion, is bad taste." Amanda Grayson was a Human teacher from Earth. She was the first wife of Sarek, as well as the mother of Spock and the foster mother of Michael Burnham.
That site gives her date of death as 2266 which conflicts with the plaque's 2258 and the picture caption, 2286, but in the infinity of space what's a discrepancy of 28 years?
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