Madeiron hailed from Hartsvale, a small kingdom near the Silver Marches. There, he was a distant cousin of the king and his lineage went back to Brun I, son of Hartkiller. Madeiron left his home for a life as an adventurer.
Finally, circa 1352 DR, he settled in Waterdeep, where he joined the City Guard. In time, he rose through the ranks to become the bodyguard and personal champion of Piergeiron.