How did Robert Baratheon die?

King Robert I Baratheon was on a boar hunting trip when he was gored by a boar. Lancel Lannister, one of his squires, provided the king with fortified wine, to ensure the king was overly drunk and would make a mistake. Had he not died from the boar, the king would have been deliberately knocked off his horse or shot with an arrow, according to Lord Varys. The king's death was arranged by his wife, Cersei Lannister, so he would not learn the truth about who actually sired his children he shared with Cersei.