The Targaryen monarchs often led armies onto battlefields ... and the spiteful move of Aegon the IV or Aegon the Unworthy. Before dying, Aegon IV, who sired numerous bastards, ended up ...

King Aegon IV Targaryen died without a legitimate heir, but a bunch of bastards. One of them, known as Bittersteel, fled to Essos with his supporters, and they became the Golden Company.