Transgender and non-binary people have existed for centuries, often holding esteemed roles in their cultures: South Asia:

: A term for individuals whose gender identity aligns with the sex they were assigned at birth. American Psychological Association (APA) Historical and Cultural Context

The “T” is part of LGBTQ+ because trans history and queer history are deeply interwoven – especially around:

So why do we stay together? Because the enemies are the same.