Also called the Forty Years War or the Talirean Civil War, the War of Five Towers is named for the five "towers" that each competed to secure the Holy Lawful Empire for themselves. These divisions continue even centuries later, as despite the distance the political fault-lines this conflict exposed were never entirely reconciled.
The first pretender was Jaraad Barcas, the Duke of Lucador and Emperor Cador II's son. His Cadorian branch of House Barcas will continue to rule in Rusante for some time, and though they were not initially party to the Red Hand conspiracy (being that they assassinated Cador II), Jaraad will perhaps surprisingly embrace the worship of Asmodeus late in life, as will his successors. Those aligned to him are known as the Lucadi, who believe to this day in a mighty and expansive Empire and a return to the glory of the Grand Old Dominion.
The second pretender was Renestrae Ofandrus, the Empress Dowager, first married to Leograce III and then briefly to Disemnius, and at the dawn of hostilities was pregnant with Disemnius's child. Renestrae and her Vosoph allies pointed to the hereditary right to the crown, and the need for stable, long-lived aristocratic rule. Unfortunately, the Vosoph cause was hamstrung early, as with wicked magic the Bastard Prince Morgade ensured the stillbirth of his nephew in the Empress's womb. Yet this fact was hidden for many years, until the deception could no longer be entirely kept, leaving many Vosophs wondering why they still fought. Some believe the Empress Dowager sought to rule in her own right, but the truth is difficult to ascertain.
The third pretender, already hinted at, was Morgade, the Earl of Freness, also called the Bastard Prince. Born out of wedlock to a Sarumite noblewoman, his father was Markadian III, making him brother to Leograce III and Disemnius both. He was given title to a minor castle and holdings in Lower Sarum by his father, from which he began to build a base of power, appealing to the Sarumite lords who long felt that their "High King" had become far more interested in the politics of the Ninevarine city-states than the more feudal obligations of their homeland. These Kronets connect the health of the land to that of the monarch, and were willing to dig into more primal, pagan traditions, including treating with a hag coven to defang the Vosoph pretender's claim, a wicked deed that would not be revealed until much later in the war. House Morgade still exists, and would maneuver themselves into a succession of High Kings of Sarum, until their power was smashed by Temurcan Barcas, the Usurper.
The fourth pretender was Artifix Seropaenes II, an ambitious and politically minded dwarf whose days as a cardinal gave her a taste for power. Known sometimes as the War Mother, she was fond of leading armies in the field, but her influence was limited as most of the nobility, while they accepted the primacy of the church in matters spiritual, did not want to give up their privileges to a new theocratic regime. She maintained the loyalty of the metropolitan princes, but even most of the Ninevar did not respect her claim. Outside of the holy cities and the dwarven Clan Nuraal (whom politicked to have her placed in this position), the strongest support for the Milatine cause was in Agurain, as she issued sacred bulls granting them further privileges and even some independence to their church, known afterwards as the Kirk. Seropaenes would outlive the conflict, surrendering to the armies of House Eherron on the dawn of the Ninevarine Empire.
The final and fifth pretender, and arguably the "winner" of the conflict, was Segurades Eherron, the Count of Kyrene. Though Segurades was distantly related to the House of Barcas, Segurades instead positioned themselves as a peacekeeper and pointed that the position was never meant to be a hereditary title, and attempted to become the defender of the faith and Lord Protector in deed. Count Kyrene and his Renic allies firmly attempted to follow the concept of the heavenly mandate, seeking guidance from Mitra and following their conscience, not merely their church. While initially the smallest and weakest faction, like Seropaenes the Count of Kyrene outlived most of his competitors, starting as a young man and becoming a venerable statesman by the end of the conflict.
In the end, despite many battles and movements, by 489 hostilities mostly ended inconclusively. Lucador and Brecheliant had bloodied themselves against each other, the Kronets consolidated control of Lower Sarum but had no desire to march beyond their borders while the northern conflicts raged, and the Milatines and Renics had fought to a standstill, with Kolikis as their frontline. Eventually, the war was ended with an occupation by a foreign power: The Commonwealth invaded the south, with forward bases on the Buckles and quickly turning the Free Cities into their protectorates. Claiming to be a "mission of peace," the war would end but the Interregnum would continue for some time.