As a Crest bearer, Lambert ascended to the throne of Faerghus over his older brother Rufus sometime before Imperial Year 1162, when his son and heir Dimitri was born. Around that time, a plague swept through Faerghus and claimed the life of Lambert's first wife, the queen consort. The mage and reputed holy woman Cornelia cured the plague, and out of gratitude, the royal family took her into their service.
Around 1168, Lambert personally led a campaign to subjugate the peninsula of Sreng to the northeast of Faerghus, with Lord Rodrigue serving as his right hand. The conflict resulted in the Kingdom's annexation of the southern half of Sreng.
In 1176, King Lambert was assassinated in the Tragedy of Duscur. With Crown Prince Dimitri too young to ascend to the throne, Lambert's elder brother, Grand Duke Rufus of Itha, assumed regency over the Kingdom.
Lambert is a male given name and surname, it is the Low German form of the Old High German name Landberht, which means "bright homeland." Egitte may be a corruption of the Italian name for Egypt, "Egitto" or the Latin word for knights, "Equites." Blaiddyd is the moniker of a legendary Brittonic king who encouraged the practice of necromancy, the name means "Wolf-lord" in Welsh.
- According to hidden data within the game’s code, Lambert is 190cm (6’3).
- He shares his English voice actor, Patrick Seitz, with Jeritza in Three Houses, Zeke in Echoes: Shadows of Valentia, Basilio and Laurent in Awakening as well as Hector, Draug, Garon, and Brady in Heroes.
- Seitz also served as the English voice director in Three Houses.