Varys

Varys, colloquially known as the Spider, was a Lysene eunuch who served as Master of Whispers to five different monarchs of the Seven Kingdoms of Westeros. Born a slave in Lys, he was castrated at a young age and left for dead, but survived none-the-less and eventually amassed a huge degree of power and influence in espionage. This reputation landed him a seat of the Small Council of Aerys II Targaryen, whom he served until his death during Robert's Rebellion. Varys continued to serve the new Baratheon Dynasty, but his true loyalties lied with the exiled Daenerys Targaryen. Following the Assassination of Tywin Lannister, he fled to Essos alongside Tyrion Lannister to begin serving Daenerys directly. He later accompanied her back across the Narrow Sea during her campaign to take the Iron Throne, and later redeployment to face the Army of the Dead. Varys perished during the ensuing Fall of Winterfell, where he was killed by Rickon Stark reanimated as a wight.