Stark and Baratheon vs. The King, redux
Gendry is only half Baratheon, but thanks to Joffrey’s murder-happy spree of Season 1, he is the last actual son of Robert Baratheon left alive. Now he's off with Tyrion and Davos to Dragonstone, and on to the North to fight in a greater battle than he ever could have planned for. Leading that charge is single-minded Jon Snow, who would have grown up hearing about Robert’s Rebellion. It isn’t a direct echo of history, but Gendry and Jon being part of a fighting force it is another interweaving of two great houses, with great weapons, against a King… this time The Night King.
The Battle of the Trident and Robert’s warhammer killing Rhaegar Targaryen sealed the relationship between the Great Houses of Westeros in a status quo that is only now being upended. Robert’s victory at the Trident prompted Tywin Lannister to sack King’s Landing, leading Jaime Lannister to murder Aerys, leading The Mountain to murder Ellaria Martell and her children (pissing off Oberyn), leading to Baby Daenerys being forced to flee Dragonstone for Essos, leading to Robert being King, with Jon Arryn as his hand and Cersei as his queen.
If you think about the Battle of the Trident as the conflict that defined the way the major houses of Westeros interact with each other, and realize that the direct consequences of the Rebellion led to the events we’ve been watching on the show. Thrones hasn’t stopped to tell the tale of the Battle of the Trident in full, only having characters reference the battle in passing, like Ned and Robert on the King’s Road in Season 1 and Barristan Selmy to Daenerys in Season 3, but anyone coming across the location could spring the lore at any time.