Transgenderism might seem like a relatively recent phenomenon at first. Even the word “transgender” just first appeared in print in English in 1965, and did not become widely used until the 1990s. But there is nothing new about being transgender. People have been crossing the boundaries of their assigned genders for millenia.
Recommended Episodes:
Ep21 – LGBTQ History
EP22 – The Sacred Band of Thebes
Sources:

* https://www.theproudtrust.org/resources/trans-resources/trans-history/
* https://www.cbc.ca/doczone/features/timeline-transgender-through-history
* https://www.nps.gov/articles/lgbtqtheme-transgender.htm
* Graying Rainbows podcast episode – interview with author Dr. Susan Stryker
* https://www.hrc.org/resources/understanding-the-transgender-community
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* https://www.hrc.org/resources/transgender-faq#13
* https://www.theguardian.com/lifeandstyle/2010/jun/02/brief-history-transgender-issues
* http://bilerico.lgbtqnation.com/2008/02/transgender_history_trans_expression_in.php
* http://bilerico.lgbtqnation.com/2008/02/transgender_history_the_rise_of_hatred_t.php
* https://en.wikipedia.org/wiki/Sex_reassignment_surgery#History
* https://www.transequality.org/sites/default/files/docs/resources/ntds_black_respondents_2.pdf