Attempt of assassination on Aegon I

"When Aegon returned to King's Landing, he found assassins waiting for him in the streets of his own capital. If not for Visenya, the Conqueror would not have enjoyed his conquest for very long."

- Varys The Attempt of assassination of Aegon I was an attack orchestrated by House Martell to assassinate Aegon I Targaryen at the end of the First Dornish War