I am italian so i do not know english history well, could i ask you what historical house was the inspiration for the blackfyres?

There’s a number of possibilities, depending on how you interpret things. If you focus on Aegon/Young Griff, you might see them as equivalents to the Tudors – a royal line founded on an uncertain claim (House Tudor’s claim descended from Henry V’s widow and from Henry VII’s mother being a great-great-granddaughter of Edward III), living in foreign exile as mercenaries, and making an unexpected crossing after the main civil war is over. 

If on the other hand, you focus on the successive Rebellions and the way that they were held up as an alternative to an unpopular king, I think they more resemble the Jacobites.