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Accusations of plagiarism and priority discussions
Some of Einstein's critics, like Lenard, Gehrcke and Reuterdahl, accused him of plagiarism, and questioned his priority claims to the authorship

https://en.wikipedia.org/wiki/Criticism_of_the_theory_of_relativity

The question of whether Einstein's wife Mileva Marić contributed to Einstein's work has also been raised

https://en.wikipedia.org/wiki/Relativity_priority_dispute