Landuin of Mousillon was the mightiest of the Grail Companions, a group of fearsome Grail Knights who were among the deadliest warriors to walk the world. He is often described as the greatest Knight to have ever lived.
Landuins skill with blade and lance were beyond compare and his bravery, horsemanship and chivalry were above all others, a mighty feat indeed, considering he fought alongside Gilles le Breton. He became the second warrior to join the Grail Companions, riding to war alongside Gilles during his battles for unity. During the second battle Landuin and the other companions rode into an army of Orcs, where he struck down the Orcs massive Warboss whilst Fredemund of Aquitaine slew its monstrous mount.
After the Eighth Battle, the Companions turned west, towards the fairest land of Mousillon. Unfortunately, the realm of Landuin's family had been ravaged in his absence - his land had been turned to smouldering ruin, cattle lay slaughtered in blackened wasteland, and the once pure river was dark with foulness. A bilious stench carried up from swamplands where before virgin glades stood proud. The Companions rode in grim silence through the gates of Mousillon for to join with the remnants of Landuin's family and Folgar, the neighbouring Lord of Artois. Together they defended Castle Mousillon against a great Undead host marching under full moon. Beset by beasts and living dead, the Companions fought one to each wall, there to hold out alone against the foe. For an entire day Landuin was lost among the host, which pressed all around him like a sea of undeath. The Companions finally found triumph when Landuin struck down the foul Vampire sorcerer that had called the dead forth from their peace. He returned covered in gore and bearing the head of the foul creature. The remaining beasts then fled howling into the darkness of the forest.
After the securing of all the lands of the Bretonni tribes, a great meeting took place in the home of Folgar of Artois. Here, the formal dukedoms were created, and the Bretonnian calendar was introduced - thus, year 979 of the Imperial Calendar is considered year 1 of the Bretonnian one. Each of the great lords of the Bretonni, the fourteen Grail Companions, including Gilles le Breton, were named Dukes. The Dukes swore oaths of allegiance, and Bretonnia was formed.
Landuin had never again experienced joy after seeing Mousillon so tormented. Even with the unification of Bretonnia and the crowning of Gilles, Landuin could not feel triumph in his heart as did the other Companions. He rode back to mousillon and rebuilt his home, but the dukedom was forever touched by his sorrow.
In 1003 IC, Landuin and Thierulf, always competitive, had a major falling out, with some believing that the cause was over Thierulf's wife, Rosalind of Bastonne. A challenge was fought between the two mighty warriors, with Landuin eventually coming out victorious, inflicting a wound across Thierulf's face. Landuin left the courts of the Companions that very day, and from then on the sorrowful lord spent his life in mystery and seclusion.
Many years after the unification of Bretonnia, Landuin was found dead. He had passed away in his sleep, dying of a broken heart for his dead kin and the sickness upon his homeland. After his death glorious Mousillon slowly fell further into darkness, eventually becoming little more than a dark wasteland.