Introduced in 1996 's A Game of Thrones, Robert Baratheon is the eldest son and heir of Lord Steffon Baratheon and Lady Cassana Estermont of Storm 's End, the paramount of Stormlands, one of the Seven Kingdoms of Westeros, and brother to Stannis and Renly. Robert fought a rebellion which was named after him to win back his betrothed, Lyanna Stark, with the aid of her brother and his close friend, Eddard Stark, and their foster guardian Jon Arryn. After crushing the Targaryen dynasty and winning the war, Robert took the Iron Throne from his distant cousin Aerys II Targaryen (who is nicknamed "The Mad King ''), and established the Baratheon dynasty as its first king. However, due to Lyanna 's death during the war, Robert married Tywin Lannister 's daughter Cersei instead to ensure political stability.
who was the first king in game of thrones
Robert Baratheon