After Aegon's Landing, Orys Baratheon was made his Hand, making him the first Hand of the King to the Targaryen dynasty. What I want to know is if this is where the practice started. It's entrenched enough that almost all the claimants to the Iron Throne name Hands after declaring themselves King/Queen - Renly, Stannis, Dany and
all do it. Did the petty Kings of Westeros do this before Aegon's Landing or did Aegon I start the tradition?