>>510972352 (OP)Hermaphrodite Gods started a long time ago
Hermaphrodite is a intersex god from 600 BC
https://en.wikipedia.org/wiki/Category:Androgynous_and_hermaphroditic_deities
Here are the rest
OK this isn't trans though. So I say this its just showing humans have a desire around fantasies of having both types of sexual organs.
Then men have enjoyed dressing as women transvestites for a long time. However, they would have a "male face" to show to the world as well and feel ashamed for it.
So fast forward to the 1940s, drag shows and cross dressing were considered funny. Some Like It Hot was about this. It started a kernel of thought in some guys, oh this cross dressing thing is funny its okay. Then in the 1970s you had a lot of the "transvestite" thing like Rocky Horror. It became explicitly sexual but still weird. Then we had gay rights and all that.
IMHO Trans became a thing with Cher's daughter. Look at the USA artist Cher's daughter, its the Ground Zero of transgender.
For one thing, transsexual was changed to transgender to take away the "sex" connotation like you are only into it for perverted sex. No its real.
Anyway Chastity Sun Bono was her name. Became Chaz Bono. Before then you could always be free to call trannies "him/her" whatever you wanted. Then something happened. Everyone said "I am being nice to Cher's daughter and calling her a HIM because I like Cher" this started the cultural morality of calling trans by their decided gender as a manner of politeness, because of Chaz. You can definitely say current morals around transgenders were from Hollywood in the 90s-2000s. Once people became permissive about respectfully using the "correct gender" of the trans person and started to push it as rightness and deadnaming as terrible uncool behavior then that is when trans as a movement truly took hold.