The claims of the ancient House Targaryen have only strengthened over time. Daenerys, who claims the title of Queen of Westeros, launches an invasion of the mainland after years spent building up her faction's strength. She gains the support of Jon Snow, in exchange for allowing him to mine dragonglass for the war against the White Walkers. Her armies defeat the Lannisters and Tullys in battle and bring their soldiers into her faction, but she also suffers the loss of her key Greyjoy allies, and one of her dragons is killed (then reanimated) by the White Walkers.
House Targaryen's biggest challenge is still to come, with the reveal that there is a previously unknown Targaryen heir: Aegon Targaryen, known for the past several seasons as Jon Snow. Samwell and Gilly discover that Rhaegar, Dany's late brother, had annulled his marriage with the intent to marry someone else. This knowledge means Jon is actually the trueborn heir of Rhaegar and Lyanna Stark, making him the rightful heir to the Iron Throne. House Targaryen's incestuous past is also returning, albeit unknown to the participants: Jon and Dany have fallen in love, unaware they are biologically nephew and aunt.