The Thronal Wars were a long period of succession dispute between two rival branches of the House of Moran - the branch descended from the deposed Richard III, and the branch descended from the Duke of Atholl. Richard III died shortly following his deposition, and the claim of his only surviving child, Jane, would have been irrelevant had she not married Richard, Duke of Monmouth in 1465, the son of Kenneth III's third son, John, Duke of Monmouth. This gave Richard the combined claims of Kenneth III's first and third sons.
However, whilst Richard was still young the House of Atholl ruled Harrow largely unchallenged. William I faced an initial uprising in the eastern highlands to restore Richard III, but William had the popular support of the majority of powerful landed families and the rebellion was easily quashed. Richard III died soon afterwards in exile.
William's son's, Henry III's, reign did much to consolidate the popularity and the position of the House of Atholl. He allied with Gaul in its long war against Chelta on the Continent and delivered Harrow many military successes fighting against the Cheltish. The war provided an opportunity for many aristocrats to bring back wealth and win glory fighting on the Continent and Henry gained popularity for this. A Monmouthite plot in support of the maturing Richard, Duke of Monmouth, was discovered during the back half of Henry's reign, which almost succeeded. Its conspirators, primarily the Earl of Lothian, were executed for treason, although Richard himself was not involved as he remained in exile in Chelta. Henry's son, called Henry, came to the throne in 1489.
Henry IV did not partake in any foreign wars or expeditions, but proved an able defender of the realm. He was the first Athollite king to be faced with active Monmouthite rebellions. Indeed, the military period of the Thronal Wars began in 1503 when a 33-year old Richard, Duke of Monmouth led an attack on the southern borders of the Harrowlands with Cheltish support. The attack was not intended as an attempt on the throne but to announce his intention to contest the throne, to shake Henry's crown and to rally support for his claim. Three further, more serious Monmouthite revolts were conducted against Henry with the support of ever more aristocratic families discontent with Henry's passive reign, although Henry was able to defend his crown with the help of loyal supporters.
Henry IV died unexpectedly in 1512, leaving only his daughter, Emma, to assume the throne. Queen Emma reigned for only five years. She proved a strong ruler in her own right but failed to command the support and loyalty of the aristocracy. The Monmouthite claim gained support during her reign, much due to Emma's unpopular marriage to the foreign prince Owain Glendower, Prince of Glamorgan whom she relied on moreso than the aristocracy. Historians claim that she held her throne for five years only due to the support of Glamorgan.
In 1517 Richard, Duke of Monmouth had consolidated enough support among the Harrovian aristocracy to return from exile and seize the throne. He was received with rapturous applause when he paraded through Roedean and his support among the people was enough that he was able to rule in relative peace for nine years, although Athollite rebellions arose in the north of the Harrowlands. The last Athollite stronghold in Yarbyshire was conquered in 1526 after a nine year siege, although Richard, like Henry IV, died unexpectedly four years later in 1530. His son Edmund succeeded.
Edmund I was originally renowend as a strong ruler, but soon fell to ill health. He suffered episodic breaks of ill health and ruled inconsistently. This provided the opportunity for the Athollites to seize land and rally support. By 1539 support among the aristocracy had swung against Edmund sufficiently to allow the pretender Malcolm, Prince of Kent, to make a move on the throne, backed primarily by an aristocratic coalition led primarily by the Mordaunt and Bulstrode families. Malcolm, Prince of Kent, being the last Athollite male, launched an invasion in 1539 from Kent on the south-western coast of Harrow and marched through the south of the country rallying people to his cause before being met by Edmund's forces at Kinharrock. There, at the Battle of Kinharrock he defeated Edmund, seized the Crown in 1539, becoming King Malcolm VII and establishing the House of Kent.