In a new book chapter, Susanne Bobzien is claiming that famous philosopher of logic Gottlob Frege plagiarized extensively from the Stoic logicians. You probably need the book to read the full argument (and I haven't), but it's summarized at https://dailynous.com/2021/02/03/frege-plagiarize-stoics/ and discussed at https://www.metafilter.com/190330/Frege-plagiarized-the-Stoics

See also the response https://handlingideas.blog/2021/02/05/the-stoic-foundations-of-analytic-philosophy-on-susanne-bobziens-groundbreaking-discovery-in-frege-and-prantl/ linked from the Daily Nous comments.