The wars between humans and Gungans took place in the decades after around 4000 BBY. These conflicts encompassed a number of wars on the planet Naboo between the Grizmallti human colonists and the indigenous Gungans. Around 4000 BBY, the Grizmallti landed on Naboo, seeking sanctuary from a civil war on their home planet. They came across the Gungans, and despite the best endeavors of envoys from both factions, discussions deteriorated, and they engaged in violent wars for territory and supplies over the subsequent decades. In the end, a fragile truce was reached, with both parties consenting to disregard each other while coexisting on the planet; the humans remained on the surface, eventually adopting the name Naboo, while the Gungans made their homes underwater.
The initial reference to the conflict between the Grizmallti and the Gungans appeared in Nexus of Power, a 2016 book of resources released for the Star Wars: Force and Destiny roleplaying game.