The Third Crusade (High Imperial: Tertia Expeditio Sacra) was a small conflict that was initially between the Kingdom of Norland and the Holy Orenian Empire, though it quickly grew to be a large scale conflict involving most of the major powers of the world, including the then newly formed Kingdom of Renatus, the remnants of the Sixth Empire under the banner of the Apostolic Kingdom of Marna, and after their capitulation in the year 1640, the Kingdom of Santegia, versus the Kingdom of Norland.
- 1638 - Battle of the Bloody Road - Norlandic Victory
- 1640 - Battle of Rochdale - Crusader Victory
- 1641 - Siege of Vjorhelm - Crusader Victory
- Immediately following the end of the War of the Beards,the Kingdom of Norland declares war against the Holy Orenian Empire, hoping to avenge their defeat at the Sack of Seahelm nearly a century ago.
- The city of Adelburg is couped by Lord Aurelius. Emperor John VI is slain and beheaded, his body paraded through the city.
- The Norlandic host engages the host of Imperial remnants outside the city of Adelburg, defeating them at the Battle of the Bloody Road.
- The Norlandic victory permitted them to siege the city of Adelburg, not knowing that the city had fallen to the newly established Kingdom of Renatus just a few years prior. Upon hearing of their mistake, King Javier lifted the siege and marched his forces back to Norland.
- Clashes between pagans within the Kingdom of Santegia and the Order of Saint Lucien, in which Lord Demetrios Palaiologos was murdered, cause King Leo I to exile Canonist clergy and denounce High Pontiff Everard IV.
- Everard IV declares Holy Crusade against the Kingdom of Santegia and the Kingdom of Norland.
- Major skirmishes occur, resulting in multiple primarily around San Adrian, resulting in victories for the Crusaders.
- The Axionite Coalition is silently disbanded.
- The Crusaders take the offensive, marching their combined hosts out from the city of Adelburg. They meet the Norlanders in combat once more on the bloody road, resulting in a decisive victory for the Crusaders in the Battle of Rochdale, leaving Norland open for further attacks.
- King Leo I and High Pontiff Everard IV agree upon peace terms, resulting in the Kingdom of Santegia acknowledging Canonism as their state religion and joining the Crusade against Norland.
- King Javier I abdicates to his son, Prince Jevan.
- The Crusader host encircles the Norlandic capital of Vjorhelm, successfully assaulting it after a five month siege.
- King Jevan I flees after Vjorhelm is taken, and Jory Ruric is crowned King.
- In a secret meeting, the new King of Norland swears fealty to King Aurelius, ending the Crusade.