Not sure which book this spoilers but I thought I'd add that anyway. If I can narrow it down to book 1 or something let me know. I mean it has the fact that Robert has Targ blood and the fact that Aemon is a targ but both are known to showfags right?
Yeah the Martells were married into the Targs in order to form an alliance and bring Dorne into the fold. Since then the Dornish have probably been the Targaryeans biggest allies
Yea Roberts grandmother was a Targ which was his claim to the throne Not to mention the founder of his house was a bastard Targ