* Snow White (1937): While not technically a queen, Snow White is often considered the first Disney princess, and she does rule over a kingdom alongside her seven dwarfs.
* The Queen (Snow White, 1937): The evil stepmother in Snow White is the first character who holds the title of queen in a Disney film. However, she's not a protagonist and is presented as a villain.
* Queen Clarion (Sleeping Beauty, 1959): She's the first benevolent queen to play a major role in a Disney movie and is even the Fairy Godmother of Aurora, the titular princess.
* Queen Grimhilde (Sleeping Beauty, 1959): Also known as Maleficent, this powerful queen is the main antagonist and is another example of a queen in early Disney films.
Ultimately, it's up to interpretation which queen you'd consider the "first" depending on what criteria you use. Let me know if you have any other Disney-related questions!