Emperor
Balduran , the Brave (a.k.a. The Emperor)
Balduran the Brave was a Human explorer and adventurer, who was the first Faerûnian to visit the continent of Anchorome, and is usually creditted as the founder of Baldur's Gate, to which he gave his named.
He left the city in search of further adventue in the mid-11th century, and disappeared from records shortly thereafter following a shipwreck.
Although he was widely believed to have died, it appears he found some magical means of entending his life, because when he returned to the shores of Faerûn two centuries later he was still in the prime of his life.
On his quest for adventure, he sought out Moonrise Towers, and the caves below Reithwin Town, which had a reputation for being filled with treasure despite no explorers ever having returned from their depths.
But what he found was something worse than he could have imagined: a Mindflayer colony, ruled by an Elder Brain.
He was infected, and although he was rescued by the bronze dragon Ansur, his old ally, it was not in time to prevent his transformation.
However, he found he enjoyed being a Mind Flayer, and when Ansur sought to put him out of his misery, he killed his old friend, entombing his body in the Wyrmway beneath Wyrm's Rock.
For more than a century, Balduran, now calling itself the Emperor, manipulated the city from the shadows via the Knights of the Shield, before he was discovered and captured by Enver Gortash, who eventually returned him to the Elderbrain to be made part of the hive mind.
He as assigned to work on the Nautiloid. After infecting Tav, he encountered Shadowheart and the Astral Prism. Realising the prism shielded him from the Elder Brain, he entered the Astral Prison, from where he advised The Party.
Relationships

Date of Birth
11th Century DR
Date of Death
Mid 14th Century DR (ceremorphosis) | 1492 (killed)
Year of Death
1492 DR
Circumstances of Death
Killed by The Party
Birthplace
Place of Death
The skies above Baldur's Gate
Spouses
Siblings
Children
Pronouns
It/Its | He/Him
Sex
Male
Gender
Formerly a man
Founded Settlements