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If we're going that direction, National Semiconductor had a 2 'core' COPS4 processor in 1981[1]. I have some in a tube somewhere (unused).

[1] https://www.cpushack.com/2014/08/25/national-semiconductor-c...

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Yes, Retro SE also points out the Intel 8271 from 1977 was a dual core microcontroller.

Depends on your definition. The 8271 wasn't programmable by anyone but Intel (at least, they never made that a market option), and the second core was more of a bit-oriented coprocessor, sorta like saying the 80486 is a 2-core processor because of the FPU.

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