Before Daenerys Targaryen becomes the famous “Mother of Dragons” in Game of Thrones, her ancestor Princess Rhaenyra Targaryen will be the first ruling queen of Westeros.

Milly Alcock, 22, as Rhaenyra in first five episodes of ‘GoT’ spin-off series “Dragon Palace” She told the Post that she hadn’t watched “GoT” before getting the role.

“But of course I know,” she said. “I know it’s very big and very popular. [After getting cast], I watch it ready. I finished all 8 seasons in 2 weeks. It was intense and I quickly became a fan and understood why everyone loved it. “

“The Dragon’s House” (Sundays at 9pm) hyperbaric) is set some 200 years before the events of Game of Thrones and follows the silver-haired, dragon-riding Targaryens, ancestors of Daenerys and Jon Snow. As introduced in Sunday’s series premiere, King Viserys I (Paddy Considine) sits on the Iron Throne and has just named his daughter Princess Rhaenyra as his heir — despite the fact that Female domination is not the norm, and his advisers fear it will throw the field into chaos.

Alcock, 22, is an Australian actress (“The Gloaming”) living in London. She was still living in her mother’s attic when she got a call saying she was getting the high-profile part.

“I was in shock and disbelief. It wasn’t until I actually went into pre-production to fully process it and get myself excited about it and no longer felt like I was going to be fired,” she said. “The throne room is so cool. Every time you step on the set, the freshness never goes away.”

She said that while she liked Emilia Clarke’s performance as Daenerys, she didn’t draw inspiration from it to play Rhaenyra. “Obviously, there are similarities in their basic morals as people, but in the end they act very differently around the world.”

Instead, she draws inspiration from two other sources.

“Cate Blanchett in ‘The Golden Age’ and Audrey Hepburn in ‘Roman Holiday’. If you can bring these two women together, I think it’s Rhaenyra. She’s witty and cheeky, But she has to keep performing and live up to that regal role. But, you can see under the surface, she’s uncomfortable in her skin.”

As the first episode of “House of the Dragon” shows, Rhaenyra has an unusual relationship with her demonic uncle (Matt Smith, “The Crown”), a relationship that has an undertone of frivolity (Targaryen). The family is very pro incest, so that part doesn’t care much about them).

“Matt and I agreed: [the relationship] It’s being charged, but it’s under the surface,” Alcock said. “It’s almost like they have two dialogues in every scene. It’s like what they’re actually saying, and what they’re saying with their body language, their eyes, and their tone of voice. It was really fun playing with Matt and working with Matt. He’s such a generous actor, he’s so kind and thoughtful, and it enhances my performance.

“I think Rhaenyra is at an age where she can’t differentiate between platonic love, romantic love and lust because she hasn’t lived long enough and hasn’t been through those experiences. So, I think she understands that there’s a feeling here [with Daemon], but she’s not quite sure where it lands and what to do with it and navigate it, which is what makes this dynamic so interesting. “

With “Game of Thrones” the biggest show in the world between 2011 and 2019, Alcock said the cast of “House of Thrones” felt pressured.

“Of course we did. But not when we were filming. It was only during this part that we were reminded how big it was. I really didn’t know what to do with it. It was very intimidating. So, I was more than usual. More reclusive. Just gaining the confidence to interact with that craze — you want to do them justice. As an actor, it’s fun to have a fan base already and not a fan base coming to you.

“It’s almost like they have to accept us first. It will be interesting to hear everyone’s reaction.”